A Full Information to Seaborn

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# Introduction

 
Seaborn is a statistical visualization library for Python that sits on high of Matplotlib. It offers you clear defaults, tight integration with Pandas DataFrames, and high-level capabilities that cut back boilerplate. In case you already know Matplotlib and wish sooner, extra informative plots, this information is for you.

The main target right here is intermediate to superior utilization. You’ll work with relational, categorical, distribution, and regression plots, then transfer into grid layouts and matrix visuals that reply actual analytical questions. Count on brief code blocks, exact explanations, and sensible parameter decisions that have an effect on readability and accuracy.

What this information covers:

• Arrange themes and palettes you’ll be able to reuse throughout initiatives
• Plots that matter for evaluation: scatterplot, lineplot, boxplot, violinplot, histplot, kdeplot, regplot, lmplot
• Excessive-dimensional layouts with FacetGrid, PairGrid, relplot, and catplot
• Correlation and heatmaps with appropriate coloration scales, masking, and annotation
• Exact management by way of Matplotlib hooks for titles, ticks, legends, and annotations
• Efficiency suggestions for giant datasets and fixes for frequent pitfalls

You’ll study when to make use of confidence intervals, easy methods to handle legends in crowded visuals, easy methods to maintain class colours constant, and when to change again to Matplotlib for high quality management. The purpose is obvious, correct plots that talk findings with out additional work.

# Setup and Styling Baseline

 
This part units a constant visible baseline so each plot within the article seems skilled and export-ready. We are going to set up, import, set a worldwide theme, select sensible palettes, and lock in determine sizing and DPI for clear outputs.

// Set up and import

Use a clear surroundings and set up Seaborn and Matplotlib.

pip set up seaborn matplotlib

Commonplace imports:

import seaborn as sns
import matplotlib.pyplot as plt
import numpy as np
import pandas as pd

Two fast checks that assist keep away from surprises:

// Mission-wide theme in a single line

Set a default model as soon as, then deal with the evaluation as an alternative of fixed styling tweaks.

sns.set_theme(
    context="discuss",      # textual content measurement scaling: paper, pocket book, discuss, poster
    model="whitegrid",   # clear background with mild grid
    palette="deep"       # readable, colorblind conscious categorical palette
)

Why this issues:

• context="discuss" offers readable axis labels and titles for slides and reviews
• model="whitegrid" improves worth studying for line and bar plots with out heavy visible noise
• palette="deep" gives distinct class colours that maintain up when printed or projected

You’ll be able to override any of those per plot, however setting them globally retains the look uniform.

// Palettes you’ll really use

Select palettes that talk the info sort. Use discrete palettes for classes and colormaps for steady values.

1. Viridis for steady scales

# Discrete colours for classes
cats = sns.color_palette("viridis", n_colors=5)

# Steady colormap for heatmaps and densities
viridis_cmap = sns.color_palette("viridis", as_cmap=True)

• Viridis preserves element throughout mild and darkish backgrounds and is perceptually uniform
• Use n_colors= for discrete classes. Use as_cmap=True when mapping a numeric vary

2. Cubehelix for ordered classes or low-ink plots

# Mild-to-dark sequence that prints properly
dice = sns.cubehelix_palette(
    begin=0.5,    # hue begin
    rot=-0.75,    # hue rotation
    gamma=1.0,    # depth curve
    mild=0.95,
    darkish=0.15,
    n_colors=6
)

Cubehelix stays readable in grayscale and helps ordered classes the place development issues.

3. Mix a customized model ramp

# Mix two model colours right into a easy ramp
mix = sns.blend_palette(["#0F766E", "#60A5FA"], n_colors=7, as_cmap=False)

# In case you want a steady colormap as an alternative
blend_cmap = sns.blend_palette(["#0F766E", "#60A5FA"], as_cmap=True)

Mixing helps align visuals with a design system whereas protecting numerical gradients constant.

Set a palette globally once you decide to a scheme for a complete determine or report

sns.set_palette(cats)     # or dice, or mix

Preview a palette shortly

sns.palplot(cats)
plt.present()

// Determine sizing and DPI for export

Management measurement and backbone from the begin to keep away from fuzzy labels or cramped axes.
Set a smart default as soon as

# International defaults through Matplotlib rcParams
plt.rcParams["figure.figsize"] = (8, 5)    # width, top in inches
plt.rcParams["figure.dpi"] = 150           # on-screen readability with out enormous information

You’ll be able to nonetheless measurement particular person figures explicitly when wanted:

fig, ax = plt.subplots(figsize=(8, 5))

Save high-quality outputs

# Raster export for net or slide decks
plt.savefig("determine.png", dpi=300, bbox_inches="tight")

# Vector export for print or journals
plt.savefig("determine.svg", bbox_inches="tight")
plt.savefig("determine.pdf", bbox_inches="tight")

• dpi=300 is an effective goal for crisp net pictures and displays
• bbox_inches="tight" trims empty margins, which retains multi-panel layouts compact
• Favor SVG or PDF when editors will resize figures or once you want sharp textual content at any scale

# Plots That Matter for Actual Work

 
On this part, we’ll deal with plot sorts that reply evaluation questions shortly. Every subsection explains when to make use of the plot, the important thing parameters that management which means, and a brief code pattern you’ll be able to adapt. The examples assume you already set the theme and baseline from the earlier part.

// Relational plots: scatterplot, relplot(variety="line")

Use relational plots to point out relationships between numeric variables and to check teams with coloration, marker, and measurement encodings. Add readability by mapping a categorical variable to hue and model, and a numeric variable to measurement.

import seaborn as sns
import matplotlib.pyplot as plt

penguins = sns.load_dataset("penguins").dropna(
    subset=["bill_length_mm", "bill_depth_mm", "body_mass_g", "species", "sex"]
)

# Scatter with a number of encodings
ax = sns.scatterplot(
    knowledge=penguins,
    x="bill_length_mm",
    y="bill_depth_mm",
    hue="species",
    model="intercourse",
    measurement="body_mass_g",
    sizes=(30, 160),
    alpha=0.8,
    edgecolor="w",
    linewidth=0.5
)
ax.set_title("Invoice size vs depth with species, intercourse, and mass encodings")
ax.legend(title="Species")
plt.tight_layout()
plt.present()

For strains, favor the figure-level API once you want markers per group and simple faceting.

flights = sns.load_dataset("flights")  # 12 months, month, passengers

g = sns.relplot(
    knowledge=flights,
    variety="line",
    x="12 months",
    y="passengers",
    hue="month",
    markers=True,      # marker on every level
    dashes=False,      # strong strains for all teams
    top=4, facet=1.6
)
g.set_axis_labels("12 months", "Passengers")
g.determine.suptitle("Month-to-month passenger pattern by 12 months", y=1.02)
plt.present()

Notes:

• Use model for a second categorical channel when hue is just not sufficient
• Hold alpha barely beneath 1.0 on dense scatters to disclose overlap
• Use sizes=(min, max) to constrain level sizes so the legend stays readable

// Categorical plots: boxplot, violinplot, barplot

Categorical plots present distributions and group variations. Select field or violin once you care about unfold and outliers. Select bar once you need aggregated values with intervals.

import numpy as np
suggestions = sns.load_dataset("suggestions")

# Boxplot: strong abstract of unfold
ax = sns.boxplot(
    knowledge=suggestions,
    x="day",
    y="total_bill",
    hue="intercourse",
    order=["Thur", "Fri", "Sat", "Sun"],
    dodge=True,
    showfliers=False
)
ax.set_title("Complete invoice by day and intercourse (boxplot, fliers hidden)")
plt.tight_layout()
plt.present()

# Violin: form of the distribution with quartiles
ax = sns.violinplot(
    knowledge=suggestions,
    x="day",
    y="total_bill",
    hue="intercourse",
    order=["Thur", "Fri", "Sat", "Sun"],
    dodge=True,
    inside="quartile",
    lower=0,
    scale="width"
)
ax.set_title("Complete invoice by day and intercourse (violin with quartiles)")
plt.tight_layout()
plt.present()

# Bar: imply tip with percentile intervals
ax = sns.barplot(
    knowledge=suggestions,
    x="day",
    y="tip",
    hue="intercourse",
    order=["Thur", "Fri", "Sat", "Sun"],
    estimator=np.imply,
    errorbar=("pi", 95),   # percentile interval for skewed knowledge
    dodge=True
)
ax.set_title("Imply tip by day and intercourse with 95% PI")
plt.tight_layout()
plt.present()

Notes:

• order fixes class sorting for constant comparisons
• For big samples the place intervals add noise, set errorbar=None (or ci=None on older Seaborn)
• Conceal fliers on boxplots when excessive factors distract from the group comparability

// Distribution plots:histplot

Distribution plots reveal form, multimodality, and group variations. Use stacking once you need totals, and fill once you need composition.

# Single distribution with a easy density overlay
ax = sns.histplot(
    knowledge=penguins,
    x="body_mass_g",
    bins=30,
    kde=True,
    ingredient="step"
)
ax.set_title("Physique mass distribution with KDE")
plt.tight_layout()
plt.present()

# Grouped comparability: composition throughout species
ax = sns.histplot(
    knowledge=penguins,
    x="body_mass_g",
    hue="species",
    bins=25,
    a number of="fill",    # fraction per bin (composition)
    ingredient="step",
    stat="proportion",
    common_norm=False
)
ax.set_title("Physique mass composition by species")
plt.tight_layout()
plt.present()

# Grouped comparability: complete counts by stacking
ax = sns.histplot(
    knowledge=penguins,
    x="body_mass_g",
    hue="species",
    bins=25,
    a number of="stack",
    ingredient="step",
    stat="rely"
)
ax.set_title("Physique mass counts by species (stacked)")
plt.tight_layout()
plt.present()

Notes:

• Use a number of="fill" to check relative composition throughout bins
• Use common_norm=False when teams differ in measurement and also you need within-group densities
• Select ingredient="step" for clear edges and simple overlaying

// Regression plots: regplot, lmplot

Regression plots add fitted relationships and intervals. Use regplot for a single axes. Use lmplot once you want hue, row, or col faceting with out guide grid work.

Let’s check out an lmplot. Simply make sure the dataset has no lacking values within the mapped columns.

penguins = sns.load_dataset("penguins").dropna(
    subset=["bill_length_mm", "bill_depth_mm", "species", "sex"]
)

g = sns.lmplot(
    knowledge=penguins,
    x="bill_length_mm",
    y="bill_depth_mm",
    hue="species",
    col="intercourse",
    top=4,
    facet=1,
    scatter_kws=dict(s=25, alpha=0.7),
    line_kws=dict(linewidth=2)
)
g.set_titles(col_template="{col_name}")
g.determine.suptitle("Invoice dimensions by species and intercourse", y=1.02)
plt.present()

Notes:

• On newer Seaborn variations, favor errorbar=("ci", 95) on capabilities that assist it. If ci remains to be accepted in your model, you’ll be able to maintain utilizing it for now.
• In case you see related errors, test for different unique pairs like lowess=True, logistic=True, or logx=True used collectively.

// Interval decisions on massive knowledge

On huge samples, interval bands can obscure the sign. Two choices enhance readability:

• Use percentile intervals for skewed distributions:

sns.barplot(knowledge=suggestions, x="day", y="tip", errorbar=("pi", 95))

 

• Take away intervals totally when variation is already apparent:

sns.lineplot(knowledge=flights, x="12 months", y="passengers", errorbar=None)
# or on older variations:
sns.lineplot(knowledge=flights, x="12 months", y="passengers", ci=None)

 

Guideline:

• Favor errorbar=("pi", 95) for skewed or heavy-tailed knowledge
• Favor errorbar=None (or ci=None) when the viewers cares extra about pattern form than exact uncertainty on a really massive N

# Excessive-Dimensional Views with Grids

 
Grids enable you to examine patterns throughout teams with out guide subplot juggling. You outline rows, columns, and coloration as soon as, then apply a plotting perform to every subset. This retains construction constant and makes variations apparent.

// FacetGrid and catplot/ relplot

Use a FacetGrid once you need full management over what will get mapped to every side. Use catplot and relplot once you need a fast, figure-level API that builds the grid for you. The core thought is similar: cut up knowledge by row, col, and coloration with hue.
Earlier than the code: maintain side counts life like. 4 to 6 small multiples are straightforward to scan. Past that, wrap columns or filter classes. Management sharing with sharex and sharey so comparisons stay legitimate.

import seaborn as sns
import matplotlib.pyplot as plt

suggestions = sns.load_dataset("suggestions").dropna()

# 1) Full management with FacetGrid + regplot
g = sns.FacetGrid(
    knowledge=suggestions,
    row="time",                # Lunch vs Dinner
    col="day",                 # Thur, Fri, Sat, Solar
    hue="intercourse",                 # Male vs Feminine
    margin_titles=True,
    sharex=True,
    sharey=True,
    top=3,
    facet=1
)
g.map_dataframe(
    sns.regplot,
    x="total_bill",
    y="tip",
    scatter_kws=dict(s=18, alpha=0.6),
    line_kws=dict(linewidth=2),
    ci=None
)
g.add_legend(title="Intercourse")
g.set_axis_labels("Complete invoice", "Tip")
g.fig.suptitle("Tipping patterns by day and time", y=1.02)
plt.present()

# 2) Fast grids with catplot (constructed on FacetGrid)
sns.catplot(
    knowledge=suggestions,
    variety="field",
    x="day", y="total_bill",
    row="time", hue="intercourse",
    order=["Thur", "Fri", "Sat", "Sun"],
    top=3, facet=1.1, dodge=True
).set_axis_labels("Day", "Complete invoice")
plt.present()

# 3) Fast relational grids with relplot
penguins = sns.load_dataset("penguins").dropna()
sns.relplot(
    knowledge=penguins,
    variety="scatter",
    x="bill_length_mm", y="bill_depth_mm",
    row="intercourse", col="island", hue="species",
    top=3.2, facet=1
)
plt.present()

Key factors:

• Use order to repair class sorting
• Use col_wrap when you may have one side dimension with many ranges
• Add a suptitle to summarize the comparability; maintain axis labels constant throughout aspects

// PairGrid and pairplot

Pairwise plots reveal relationships throughout many numeric variables. pairplot is the quick path. PairGrid offers you per-region management. For dense datasets, restrict variables and contemplate nook=True to drop redundant higher panels.

Earlier than the code: select variables which can be informative collectively. Combine scales solely when you may have a cause, then standardize or log-transform first.

# Fast pairwise view
num_cols = ["bill_length_mm", "bill_depth_mm", "flipper_length_mm", "body_mass_g"]
sns.pairplot(
    knowledge=penguins[num_cols + ["species"]].dropna(),
    vars=num_cols,
    hue="species",
    nook=True,           # solely decrease triangle + diagonal
    diag_kind="hist",      # or "kde"
    plot_kws=dict(s=18, alpha=0.6),
    diag_kws=dict(bins=20, ingredient="step")
)
plt.present()

Suggestions:

• nook=True reduces muddle and quickens rendering
• Hold marker measurement modest so overlaps stay readable
• For very totally different scales, apply np.log10 to skewed measures earlier than plotting

// Combined layers on a PairGrid

A blended mapping helps you examine scatter patterns and density construction in a single view. Use scatter on the higher triangle, bivariate KDE on the decrease triangle, and histograms on the diagonal. This mixture is compact and informative.
Earlier than the code: density layers can get heavy. Cut back ranges and keep away from too many bins. Add a legend as soon as and maintain it outdoors the grid if area is tight.

from seaborn import PairGrid

g = PairGrid(
    knowledge=penguins[num_cols + ["species"]].dropna(),
    vars=num_cols,
    hue="species",
    top=2.6, facet=1
)

# Higher triangle: scatter
g.map_upper(
    sns.scatterplot,
    s=16, alpha=0.65, linewidth=0.3, edgecolor="w"
)

# Decrease triangle: bivariate KDE
g.map_lower(
    sns.kdeplot,
    fill=True, thresh=0.05, ranges=5
)

# Diagonal: histograms
g.map_diag(
    sns.histplot,
    bins=18, ingredient="step"
)

g.add_legend(title="Species")
for ax in g.axes.flat:
    if ax is just not None:
        ax.tick_params(axis="x", labelrotation=30)

g.fig.suptitle("Pairwise construction of penguin measurements", y=1.02)
plt.present()

Tips:

• Begin with 4 numeric variables. Add extra provided that every provides a definite sign
• For uneven group sizes, deal with proportions somewhat than uncooked counts once you examine distributions
• If rendering slows down, pattern rows earlier than plotting or drop fill from the KDE layer

# Correlation, Heatmaps, and Matrices

 
Correlation heatmaps are a compact option to scan relationships throughout many numeric variables. The purpose is a readable matrix that highlights actual sign, retains noise out of the way in which, and exports cleanly.

// Construct a correlation matrix and masks redundant cells

Begin by choosing numeric columns and selecting a correlation technique. Pearson is commonplace for linear relationships. Spearman is healthier for ranked or monotonic patterns. A triangular masks removes duplication so the attention focuses on distinctive pairs.

import seaborn as sns
import matplotlib.pyplot as plt
import numpy as np
import pandas as pd

# Knowledge
penguins = sns.load_dataset("penguins").dropna()

# Select numeric columns and compute correlation
num_cols = penguins.select_dtypes(embody="quantity").columns
corr = penguins[num_cols].corr(technique="pearson")

# Masks the higher triangle (maintain decrease + diagonal)
masks = np.triu(np.ones_like(corr, dtype=bool))

# Heatmap with diverging palette centered at zero
ax = sns.heatmap(
    corr,
    masks=masks,
    annot=True,
    fmt=".2f",
    cmap="vlag",
    middle=0,
    vmin=-1, vmax=1,
    sq.=True,
    cbar_kws={"shrink": 0.8, "label": "Pearson r"},
    linewidths=0.5, linecolor="white"
)

ax.set_title("Correlation matrix of penguin measurements")
plt.tight_layout()
plt.present()

Notes:

• Use technique="spearman" when variables usually are not on comparable scales or include outliers that have an effect on Pearson
• Hold vmin and vmax symmetric so the colour scale treats destructive and optimistic values equally

// Management visibility with scale and colorbar choices

As soon as the matrix is in place, tune what the reader sees. Symmetric limits, a centered palette, and a labeled colorbar forestall misreads. It’s also possible to disguise weak correlations or the diagonal to cut back muddle.

# Non-obligatory: disguise weak correlations beneath a threshold
threshold = 0.2
weak = corr.abs() < threshold
mask2 = np.triu(np.ones_like(corr, dtype=bool)) | weak  # mix masks

ax = sns.heatmap(
    corr,
    masks=mask2,
    annot=False,                 # let robust colours carry the message
    cmap="vlag",
    middle=0,
    vmin=-1, vmax=1,
    sq.=True,
    cbar_kws={"shrink": 0.8, "ticks": [-1, -0.5, 0, 0.5, 1], "label": "Correlation"},
    linewidths=0.4, linecolor="#F5F5F5"
)

ax.set_title("Sturdy correlations solely (|r| ≥ 0.20)")
plt.tight_layout()
plt.present()

Suggestions:

• cbar_kws controls readability of the legend. Set ticks that match your viewers
• Flip annot=True again on once you want actual values for a report. Hold it off for dashboards the place form and coloration are sufficient

// Massive matrices: maintain labels and edges readable

Massive matrices want self-discipline. Skinny or rotate tick labels, add grid strains between cells, and contemplate reordering variables to group associated blocks. If the matrix may be very vast, present each nth tick to keep away from label collisions.

# Artificial vast instance: 20 numeric columns
rng = np.random.default_rng(0)
vast = pd.DataFrame(rng.regular(measurement=(600, 20)),
                    columns=[f"f{i:02d}" for i in range(1, 21)])

corr_wide = vast.corr()

fig, ax = plt.subplots(figsize=(10, 8), dpi=150)

hm = sns.heatmap(
    corr_wide,
    cmap="vlag",
    middle=0,
    vmin=-1, vmax=1,
    sq.=True,
    cbar_kws={"shrink": 0.7, "label": "Correlation"},
    linewidths=0.3, linecolor="white"
)

# Rotate x labels and skinny ticks
ax.set_xticklabels(ax.get_xticklabels(), rotation=40, ha="proper")
ax.set_yticklabels(ax.get_yticklabels(), rotation=0)
ax.tick_params(axis="each", labelsize=8)

# Present each 2nd tick on each axes
xt = ax.get_xticks()
yt = ax.get_yticks()
ax.set_xticks(xt[::2])
ax.set_yticks(yt[::2])

ax.set_title("Correlation matrix with tick thinning and grid strains")
plt.tight_layout()
plt.present()

When construction issues greater than actual order, attempt a clustered view that teams related variables:

# Clustered matrix for sample discovery
g = sns.clustermap(
    corr_wide,
    cmap="vlag",
    middle=0,
    vmin=-1, vmax=1,
    linewidths=0.2, linecolor="white",
    figsize=(10, 10),
    cbar_kws={"shrink": 0.6, "label": "Correlation"},
    technique="common",  # linkage
    metric="euclidean" # distance on correlations
)
g.fig.suptitle("Clustered correlation matrix", y=1.02)
plt.present()

Tips:

• Improve determine measurement somewhat than shrinking font till it turns into unreadable
• Add linewidths and linecolor to outline cell boundaries on dense matrices
• Use clustering once you wish to floor block construction. Hold a plain ordered matrix once you want steady positions throughout reviews

# Precision Management with Matplotlib Hooks

 
Seaborn handles the heavy lifting, however closing polish comes from Matplotlib. These hooks allow you to set clear titles, management axes exactly, handle legends in tight areas, and annotate vital factors with out muddle.

// Titles, labels, legends

Good plots learn themselves. Set titles that state the query, label axes with models, and maintain the legend compact and informative. Place the legend the place it helps the attention, not the place it hides knowledge.

Earlier than the code: favor axis-level strategies over plt.* so settings keep hooked up to the correct subplot. Use a legend title and contemplate shifting the legend outdoors the axes when you may have many teams.

import seaborn as sns
import matplotlib.pyplot as plt

penguins = sns.load_dataset("penguins").dropna()

ax = sns.scatterplot(
    knowledge=penguins,
    x="bill_length_mm",
    y="bill_depth_mm",
    hue="species",
    model="intercourse",
    s=60,
    alpha=0.8,
    edgecolor="w",
    linewidth=0.5
)

# Titles and labels
ax.set_title("Invoice size vs depth by species")
ax.set_xlabel("Invoice size (mm)")
ax.set_ylabel("Invoice depth (mm)")

# Legend with title, positioned outdoors to the correct
leg = ax.legend(
    title="Species",
    loc="middle left",
    bbox_to_anchor=(1.02, 0.5),   # outdoors the axes
    frameon=True,
    borderaxespad=0.5
)

# Non-obligatory legend styling
for textual content in leg.get_texts():
    textual content.set_fontsize(9)
leg.get_title().set_fontsize(10)

plt.tight_layout()
plt.present()

Notes

• bbox_to_anchor offers you high quality management over legend placement outdoors the axes
• Hold legend fonts barely smaller than axis tick labels to cut back visible weight
• In case you want a customized legend order, move hue_order= within the plotting name

// Axis management

Axis limits, ticks, and rotation enhance readability greater than any coloration selection. Set solely the ticks your viewers wants. Use rotation when labels collide. Add small margins to cease markers from touching the body.

Earlier than the code: resolve which ticks matter. For time or evenly spaced integers, present fewer ticks. For skewed knowledge, contemplate log scales and customized formatters.

import numpy as np
flights = sns.load_dataset("flights")  # columns: 12 months, month, passengers

ax = sns.lineplot(
    knowledge=flights,
    x="12 months",
    y="passengers",
    estimator=None,
    errorbar=None,
    marker="o",
    dashes=False
)

ax.set_title("Airline passengers by 12 months")
ax.set_xlabel("12 months")
ax.set_ylabel("Passengers")

# Present a tick each 5 years
years = np.kind(flights["year"].distinctive())
ax.set_xticks(years[::5])

# Tidy the view
ax.margins(x=0.02, y=0.05)   # small padding inside axes
ax.set_ylim(0, None)         # begin at zero for clearer pattern

# Rotate if wanted
plt.xticks(rotation=0)
plt.tight_layout()
plt.present()

Extras you’ll be able to add when required

• Symmetric limits: ax.set_xlim(left, proper) and ax.set_ylim(backside, high) for truthful comparisons
• Log scaling: ax.set_xscale("log") or ax.set_yscale("log") for lengthy tails
• Fewer ticks: ax.xaxis.set_major_locator(matplotlib.ticker.MaxNLocator(nbins=6))

// Annotations, strains, and spans

Annotations name out the explanation the plot exists. Use a brief label, a transparent arrow, and constant styling. Strains and spans mark thresholds or intervals that matter.

Earlier than the code: place annotations close to the info they confer with, however keep away from overlaying factors. Think about using a semi-transparent span for ranges.

import matplotlib as mpl
suggestions = sns.load_dataset("suggestions")

ax = sns.regplot(
    knowledge=suggestions,
    x="total_bill",
    y="tip",
    ci=None,
    scatter_kws=dict(s=28, alpha=0.6),
    line_kws=dict(linewidth=2)
)

ax.set_title("Tip vs complete invoice with callouts")
ax.set_xlabel("Complete invoice ($)")
ax.set_ylabel("Tip ($)")

# Threshold line for a tipping rule of thumb
ax.axhline(3, coloration="#444", linewidth=1, linestyle="--")
ax.textual content(ax.get_xlim()[0], 3.1, "Reference: $3 tip", fontsize=9, coloration="#444")

# Spotlight a invoice vary with a span
ax.axvspan(20, 40, coloration="#fde68a", alpha=0.25, linewidth=0)  # delicate spotlight

# Annotate a consultant level
pt = suggestions.loc[tips["total_bill"].between(20, 40)].iloc[0]
ax.annotate(
    "Instance test",
    xy=(pt["total_bill"], pt["tip"]),
    xytext=(pt["total_bill"] + 10, pt["tip"] + 2),
    arrowprops=dict(
        arrowstyle="->",
        coloration="#111",
        shrinkA=0,
        shrinkB=0,
        linewidth=1.2
    ),
    fontsize=9,
    bbox=dict(boxstyle="spherical,pad=0.2", fc="white", ec="#ddd", alpha=0.9)
)

plt.tight_layout()
plt.present()

Tips:

• Hold annotations brief. The plot ought to nonetheless learn with out them
• Use axvline, axhline, axvspan, and axhspan for thresholds and ranges
• If labels overlap, regulate with small offsets or cut back font measurement, not by eradicating the annotation that carries which means

# Wrapping Up

 
You now have an entire baseline for quick, constant Seaborn work: pattern or mixture when scale calls for it, management legends and axes with Matplotlib hooks, maintain colours steady throughout figures, and repair labels earlier than export. Mix these with the grid patterns and statistical plots from earlier sections and you’ll cowl most evaluation wants with out customized subplot code.

The place to study extra:

Shittu Olumide is a software program engineer and technical author enthusiastic about leveraging cutting-edge applied sciences to craft compelling narratives, with a eager eye for element and a knack for simplifying complicated ideas. It’s also possible to discover Shittu on Twitter.