缩进

Tip

用4个空格来缩进代码

绝对不要用tab, 也不要tab和空格混用. 对于行连接的情况, 你应该要么垂直对齐换行的元素(见 行长度 部分的示例), 或者使用4空格的悬挂式缩进(这时第一行不应该有参数):

Yes:   # Aligned with opening delimiter
       foo = long_function_name(var_one, var_two,
                                var_three, var_four)
 
       # Aligned with opening delimiter in a dictionary
       foo = {
           long_dictionary_key: value1 +
                                value2,
           ...
       }
 
       # 4-space hanging indent; nothing on first line
       foo = long_function_name(
           var_one, var_two, var_three,
           var_four)
 
       # 4-space hanging indent in a dictionary
       foo = {
           long_dictionary_key:
               long_dictionary_value,
           ...
       }

No:    # Stuff on first line forbidden
      foo = long_function_name(var_one, var_two,
          var_three, var_four)
 
      # 2-space hanging indent forbidden
      foo = long_function_name(
        var_one, var_two, var_three,
        var_four)
 
      # No hanging indent in a dictionary
      foo = {
          long_dictionary_key:
              long_dictionary_value,
              ...
      }