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This article mainly explains "the summary of python introduction knowledge points". Friends who are interested may wish to have a look. The method introduced in this paper is simple, fast and practical. Next let the editor to take you to learn the "summary of python introduction knowledge points"!

1. The basic grammar of python

1. The way to connect rows is to add a'\'at the end.

two。 Comments: multiline comments triple quotation marks, # line comments; string output as is defined by three quotation marks (save original format)

3.I/O statement: separate zero or more expressions with commas, (+) can only concatenate the same data type, the return value of input is always in string format (what format needs to be cast), format output str.rjust () str to the right; str.ljust () str to the left; str.center () string centered Str.format () method, {} and: to replace%: position parameter (starting with index 0) (* list form)

4. Filling method: format: {0: [fill character] [alignment] [width]} .format (parameter table)

"" Block comment "" # line comment Zhang San = "hello world!\ n" ke = "wawdaw" Li Si = "bad" ls= ['baidu','com'] # list list# user controls print (''\ nHello\ nLine connection! Output as-is triple quotes'') print (center (20 minutes)) print (ke.ljust (10)) # spaces default to fill print (Li Si. Rjust (50 minutes)) # only one character is allowed # format method''position parameter' 'print (' I am {} '.format ("Xiao Ming")) print (' you are {1}) He is {0} '.format (' Wang Wu', 'Xiaogang') print ("www. {}. {}" .format (* ls)) # keyword parameter (set concept) has= {'name':'was','age':'18'} print (' my name is {name}, age is {age}'. Format (* * has)) print ('my name is {name}, age is {age} '.format (name= "wangqiang") Age=20) # filling method print ("I am {0: 8 ^ 20}" .format ('son of a bitch') # Precision print ('{0pur.2f} '.format (1Maple 3), end='\ t') print (' {0print b} '.format (20), end='\ t') print ('{0holo} '.format (64), end='\ t') print (' {0purx} '.format (35), end='\ t') print (' {:,} '.format (12324234324) End='\ n') # micrometer format # Index wa= ['hoho',18] print (' name is {0 [0]} age is {0 [1]} '.format (wa)) # format () contains only one list So it corresponds to zero.

Operation phenomenon

II. Operator and format planning

1. Operators: + (character concatenation), * (repeat output character), [] (get string by index), [:] (intercept character), in (member operator), not in (member operator), rUnip R (original string, used literally),% (format string)

two。 Formatting symbols:% u,% o,% x,% X,% f,% e,% E,% g,% G,% p (unsigned integer, unsigned octal, hexadecimal lowercase, hexadecimal uppercase, float can specify precision, scientific calculation format floating-point number, abbreviation with% e,% f and% g, abbreviation of% f and% G, address of hexadecimal formatted variable)

3. Arithmetic operators: * * (power), / / (divisible)

4. Comparison operation symbols: = =,! =, (unequal! =; python3 abolished), >, =,

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