如何基于字符频率绘制固定宽度、高度按比例缩放的文本？

Got it, let's build this character plot exactly as you described! Here's a step-by-step solution that gives each character a fixed width and sets its height to how often it appears in the text:

Step 1: Count Character Frequencies #

First, we need to tally up how many times each character appears (we'll exclude spaces like in your "hello world" example). Python's collections.Counter is perfect for this quick frequency counting.

Step 2: Prepare Data for Plotting #

Extract the unique characters and their corresponding frequencies into separate lists—this will be our x and y data for the plot.

Step 3: Generate the Fixed-Width Plot #

Use matplotlib's bar() function with a fixed width for each bar. We'll adjust the x-axis ticks to display the characters instead of numerical positions, so the plot is easy to read.

Here's the full code:

import matplotlib.pyplot as plt
from collections import Counter

# Input text (replace this with your own text!)
text = "hello world"

# Count frequencies of non-space characters
char_counts = Counter(c for c in text if c != ' ')

# Split into characters and their respective heights (frequencies)
chars = list(char_counts.keys())
heights = list(char_counts.values())

# Set fixed width for each character bar
bar_width = 1

# Create the plot
fig, ax = plt.subplots(figsize=(8, 4))  # Optional: adjust figure size

# Draw bars with fixed width
ax.bar(range(len(chars)), heights, width=bar_width)

# Align character labels with the center of each bar
ax.set_xticks([i + bar_width/2 for i in range(len(chars))])
ax.set_xticklabels(chars)

# Add labels and title
ax.set_title("Character Frequency (Fixed Width Bars)")
ax.set_ylabel("Frequency (Bar Height)")
ax.set_xlabel("Characters")

# Adjust layout to prevent label cutoff
plt.tight_layout()

# Show the plot
plt.show()

What this does: #

• For your "hello world" example, this will produce a plot where:
  • 'l' has a height of 3 (it appears 3 times)
  • 'o' has a height of 2 (it appears 2 times)
  • All other characters ('d', 'e', 'h', 'r', 'w') have a height of 1
• Every bar has the exact same width (set to 1 here—you can tweak bar_width if you want narrower/wider bars, just keep it a fixed value!)

内容的提问来源于stack exchange，提问作者J.G