在 Python 命令行上定义函数时出现语法错误-Python问题

Syntax error when defining a function on the Python command line(在 Python 命令行上定义函数时出现语法错误)

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问题描述

我正在尝试在 Python REPL 上定义一个函数.每次我尝试运行以下代码时，都会出现语法错误.

代码:

def hello():打印(你好！")你好()

错误:

C:Users~Desktop>pythonPython 3.6.5(v3.6.5:f59c0932b4，2018 年 3 月 28 日，16:07:46)[MSC v.1900 32 位(英特尔)] 在 win32 上输入帮助"、版权"、信用"或许可"以获取更多信息.>>>定义你好():...打印(你好！")... 你好()文件<stdin>"，第 3 行你好()^SyntaxError:无效的语法

我在 stackoverflow 上遇到的一个可能的解释是这篇文章

I am trying to define a function on the Python REPL. Every time I try to run the below code, I get a syntax error.

Code:

def hello():
    print ("Hello!")
hello()

Error:

C:Users~Desktop>python
Python 3.6.5 (v3.6.5:f59c0932b4, Mar 28 2018, 16:07:46) [MSC v.1900 32 bit (Intel)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> def hello():
...     print ("Hello!")
... hello()
  File "<stdin>", line 3
    hello()
        ^
SyntaxError: invalid syntax

A possible explanation I've come across on stackoverflow is this post Python Error : File "<stdin>" where it says I can't run scripts from the Python interpreter. If that's true, why is that the case? I.e. if I'm able to run >>>2+2 in the cmd window, why am I not able to run a 'def' function? Hoping to look for clarification on this point - Thanks!

Edit: Put the error in text, not just the pic.

解决方案

Press enter once after defining your function (that is, enter one blank line). Essentially, this lets Python know that you are done defining your function.

Once you see >>> again, you can call your function.

See the picture for how it should look when done right:

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