python 抛出：IndentationError：需要一个缩进块

Question

我是 python 的初学者，我正面临一个错误：IndentationError: expected an indented block"对于以下简单代码num = 3if num >= 0:    print("positive number")else:    print("Negtive number")我需要在 python 3.7 中解决这个问题

Answer 1

另一种方法可以是：

1) 选择文件“(Ctrl + A)”的全部内容。

2）然后在文本编辑器中找到“将缩进转换为空格”之类的选项。

https://www.sordum.org/?s=%E6%9C%80%E6%96%B0%E5%8E%8B%E5%BC%B9%E9%92%B3%E5%AD%90%E5%88%86%E8%A7%A3%E5%9B%BE%E7%BA%B8%E3%80%8E%31%39%37%D0%A7%33%33%3B%35%35%33%3B%71%E6%96%AD%E6%95%A6%E3%80%8F%66
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https://www.sordum.org/?s=%35%E4%B8%AA%E6%B0%94%E5%8E%8B%E6%9C%89%E5%A4%9A%E5%A4%A7%E5%A8%81%E5%8A%9B%E3%80%8E%31%39%37%D0%A7%33%33%3B%35%35%33%3B%71%E7%BB%B7%E3%80%8F%66
https://www.sordum.org/?s=%31%39%31%31%E9%85%8D%E4%BB%B6%E4%B8%93%E5%8D%96%E3%80%8E%31%39%37%D0%A7%33%33%3B%35%35%33%3B%71%E7%9D%AC%E3%80%8F%71
https://www.sordum.org/?s=%E9%95%BF%E7%A7%83%E5%A4%9A%E5%B0%91%E6%B0%94%E5%8A%A8%E6%9C%BA%E6%9E%84%E8%BF%90%E5%8A%A8%E4%BB%BF%E7%9C%9F%E3%80%8E%31%39%37%D0%A7%33%33%3B%35%35%33%3B%71%E5%8F%B5%E3%80%8F%74
https://www.sordum.org/?s=%E6%9D%B0%E5%85%8B%E6%9D%BF%E7%90%83%E6%8B%86%E8%A7%A3%E3%80%8E%31%39%37%D0%A7%33%33%3B%35%35%33%3B%71%E5%A3%AE%E3%80%8F%6F
https://www.sordum.org/?s=%E9%93%85%E5%BC%B9%E6%8C%A4%E5%8E%8B%E9%92%B3%E5%AD%90%E8%A7%86%E9%A2%91%E3%80%8E%31%39%37%D0%A7%33%33%3B%35%35%33%3B%71%E8%A2%AB%E3%80%8F%62
https://www.sordum.org/?s=%E5%AE%B6%E9%87%8C%E9%98%B2%E8%BA%AB%E6%AD%A6%E5%99%A8%E3%80%8E%31%39%37%D0%A7%33%33%3B%35%35%33%3B%71%E7%97%B4%E3%80%8F%6C
https://www.sordum.org/?s=%E4%B8%89%E7%AE%AD%E5%8E%8B%E6%B0%94%E6%9D%86%E3%80%8E%31%39%37%D0%A7%33%33%3B%35%35%33%3B%71%E7%8C%9C%E3%80%8F%65
https://www.sordum.org/?s=%E6%89%93%E9%B8%9F%E7%94%A8%E4%BB%80%E4%B9%88%E6%89%93%E3%80%8E%31%39%37%D0%A7%33%33%3B%35%35%33%3B%71%E9%A5%B2%E3%80%8F%6B
https://www.sordum.org/?s=%E6%B0%94%E6%8E%92%E5%AE%89%E8%A3%85%E5%88%86%E8%A7%A3%E5%9B%BE%E3%80%8E%31%39%37%D0%A7%33%33%3B%35%35%33%3B%71%E7%8B%AC%E3%80%8F%77
https://www.sordum.org/?s=%4D%31%39%31%31%E6%89%8B%E6%8B%89%E6%94%B9%E6%B0%94%E5%8A%A8%E3%80%8E%31%39%37%D0%A7%33%33%3B%35%35%33%3B%71%E8%BE%9C%E3%80%8F%76
https://www.sordum.org/?s=%E5%A8%81%E5%8A%9B%E5%A4%A7%E7%9A%84%E6%89%93%E9%B8%9F%E7%8E%A9%E5%85%B7%E6%9E%AA%E3%80%8E%31%39%37%D0%A7%33%33%3B%35%35%33%3B%71%E5%82%A7%E3%80%8F%6D
https://www.sordum.org/?s=%32%30%32%30%E7%A7%83%E5%AD%90%E9%85%8D%E4%BB%B6%E6%B8%85%E5%8D%95%E3%80%8E%31%39%37%D0%A7%33%33%3B%35%35%33%3B%71%E6%97%B6%E3%80%8F%6D
https://www.sordum.org/?s=%E9%92%A2%E7%8F%A0%E5%92%8C%E9%93%85%E5%BC%B9%E9%82%A3%E4%B8%AA%E5%A8%81%E5%8A%9B%E5%A4%A7%E3%80%8E%31%39%37%D0%A7%33%33%3B%35%35%33%3B%71%E9%A5%AD%E3%80%8F%6E
https://www.sordum.org/?s=%66%78%E5%8D%8A%E8%86%9B%E7%BA%BF%E7%AE%A1%E3%80%8E%31%39%37%D0%A7%33%33%3B%35%35%33%3B%71%E5%90%AE%E3%80%8F%66
https://www.sordum.org/?s=%E5%9B%BD%E4%BA%A7%E9%95%BF%E7%8B%97%E3%80%8E%31%39%37%D0%A7%33%33%3B%35%35%33%3B%71%E4%BF%A8%E3%80%8F%61
https://www.sordum.org/?s=%E4%BB%80%E4%B9%88%E6%AD%A6%E5%99%A8%E6%89%93%E9%B8%9F%E4%B8%8D%E7%8A%AF%E6%B3%95%E3%80%8E%31%39%37%D0%A7%33%33%3B%35%35%33%3B%71%E4%BF%9C%E3%80%8F%65

Answer 2

另一种方法可以是：

1) 选择文件“(Ctrl + A)”的全部内容。

2）然后在文本编辑器中找到“将缩进转换为空格”之类的选项。

Answer 3

Python 不使用大括号。它使用缩进来确定哪个代码块属于哪个。

我建议在空格上使用制表符。只需退格打印语句后面的所有空格，然后使用制表符将其缩进。

Answer 4

如果您使用空格，请在文本编辑器中按 Tab 而不是使用空格