Python indentation in question

Accustomed to using C, C ++, Java programming language of the people, might be the beginning of a python are not used, because the various statements if, while, etc., python code block, unlike C language as with braces to contain, but strictly used to indent the code more concise. emphasis is consistent python code blocks, i.e. each block of statements is the same indentation.

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Let's look at a few examples

1. When such situations arise is also being given python

>>>   i =5
SyntaxError: unexpected indent
>>> 

i = 0
 print(i)


 print(i)   #报错
 ^
IndentationError: unexpected indent

2. python indentation in the strict control of a uniform code block, the length is not the same when retracted will be given

i = 0
while i < 5:
    print(123)
  print(456) i += 1 print(456) #报错 ^ IndentationError: unindent does not match any outer indentation level 

 

python spaces and allows a single tab (tab key) to indent, generally indented one tab, i.e. four spaces, will automatically help users PyCharm indentation

i = 0
while i < 3:
    print(123)
    print(456) i += 1 输出的结果为 ： 123 456 123 456 123 456

i = 0
while i < 3:
 print(123)
 print(456) i += 1 输出的结果为 ： 123 456 123 456 123 456