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xgqfrms · 2026-04-09 · via 博客园 - xgqfrms

How to run for loop in Python REPL All In One

Python REPL & for loop

error

$ py3
Python 3.10.12 (main, Mar  3 2026, 11:56:32) [GCC 11.4.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> cart = ["milk", "eggs", "apples"]
>>> for item in cart:
...   print(item)

image

solution

在 Python REPL 中,写完代码块必须按一次回车(空行),告诉解释器“代码结束了”。

在 Python REPL 里写 for 循环要记住:

  1. 冒号 : 必须有
  2. 下面的代码必须缩进
  3. 最后一定要回车空一行才能执行 ✅

https://chatgpt.com/c/69d71360-5844-8329-8e73-ebefdbd37e89

demos

>>> for i in range(3):
...     print(i)
... 
0
1
2
>>> cart = ["milk", "eggs", "apples"]
>>> for item in cart:
...   print(item)
... 
milk
eggs
apples
>>> 

image

refs

https://stackoverflow.com/questions/67310343/using-for-loops-in-python-interpreter



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