Python rookie tutorial 3: basic grammar

Quinn East 2020-11-17 22:52:41
python rookie tutorial basic grammar

Rookie tutorial corresponding website :

  • code :python3 use UTF-8 code , All strings are unicode character string , You can also specify different codes .
  • identifier : The first character must be a letter or underscore , It consists of an alphanumeric underline , Case sensitive
  • Reserved words :keyword
  • notes : With # start , You can also use ''' perhaps """ The framed part
  • Indent : You don't need braces , The number of indented spaces is variable , But the same code block must contain the same number of indented spaces
    • Indent error :
      IndentationError: unindent does not match any outer indentation level
  • Multi line statement : If The sentence is longer, use the backslash \ Implement multiline statements , But in the [],{},() There is no need to use backslashes for multiline statements in .
  • Numeric type :int Integers ,bool Boolean ,float Floating point numbers ,comlex The plural
  • character string : Backslash can be used to escape , But the string is preceded by r You can keep the backslash from escaping
    • String index from left to right from 0 Start , From right to left, from -1 Start
    • python String in cannot be changed , But it can be converted to a list and then modified .
    • python No separate character type , One character is the length of 1 String .
    • Three quotes can specify a multiline string
    • String truncation Syntax :    Variable [ Under head table : Tail subscript : step ]
  • Blank line : Methods between functions and between classes are separated by empty lines , Indicates the beginning of a new piece of code
  • One line, many sentences : Use semicolons between statements ; Segmentation
  • Multiple statements make up a code group : The first line of keywords begins , End with a colon
  • input Input ,print Output
    • print The default output is line feed , If you don't wrap, you have to put it at the end of the variable add ,end=''" 
    • print( x, end=" " )
  • Import : use import and from...import Import the corresponding module


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