终端打印方块异常：Unicode █显示为矩形的解决求助

Problem Description #

I'm trying to generate a QR code in the terminal using the Unicode character █ (U+2588, solid black square), but it's displaying as a rectangle instead of a square. I'm using the DejaVu Sans Mono font and working in a Python 3 environment. Here's my relevant code:

import sys

def print_cmd_qr(qrText, white=u'/u2588', black=' ', enableCmdQR=True):
    blockCount = int(enableCmdQR)
    if abs(blockCount) == 0:
        blockCount = 1
    white *= abs(blockCount)
    if blockCount < 0:
        white, black = black, white
    sys.stdout.write(' '*50 + '\r')
    sys.stdout.flush()
    qr = qrText.replace('0', white).replace('1', black)
    sys.stdout.write(qr)
    sys.stdout.flush()

Solution #

Let's break down the fixes and adjustments you can make to get square blocks:

• Fix the Unicode escape code first
  You've got a small typo in your code: u'/u2588' uses a forward slash instead of a backslash. It should be u'\u2588' (or just '\u2588' in Python 3, since strings are Unicode by default). This mistake might be the root cause of your incorrect character display.

• Tweak your terminal font or settings
  While DejaVu Sans Mono supports U+2588, some terminal environments or font versions render it with a non-square aspect ratio:

  • Try switching to a terminal-optimized monospaced font like Fira Code, Consolas (Windows), or Menlo (macOS) — these are built to keep block characters strictly square for use cases like terminal QR codes or ASCII art.
  • If you want to stick with DejaVu Sans Mono, make sure you have the full, updated version installed (stripped-down versions may lack proper Unicode rendering).
  • Check your terminal's display settings: most let you adjust line height and character width. Set the line height to match the character width (a 1:1 ratio) to stop the block from stretching vertically into a rectangle.

• Use a modern terminal emulator
  Older terminals (like Windows' classic Command Prompt) have spotty Unicode support. Switch to a modern option like Windows Terminal (Windows), iTerm2 (macOS), or Konsole (Linux) — these handle Unicode block characters far more reliably.

内容的提问来源于stack exchange，提问作者notyeat