Python learning notes (7) Python string (4), learning notes python

Python learning notes (7) Python string (4), learning notes python

Input and Output

Input Function raw_input (Python3: input)

1 >>> raw_input ("enter a letter ") # To obtain A function 2 of the input content, enter A letter A 3 'A' 4 >>> 5 >>>> name = raw_input ("Please input your name :") # assign a value to the input content to the variable 6 Please input your name: tom 7 >>> name 8 'Tom '9 >>> x = raw_input ("how old are you? ") 10 how old are you? X = raw_input ("how old are you? ") 11 >>> x = raw_input (" how old are you? ") 12 how old are you? 2213 >>> x14 '22' 15 >>> type (x) # The result obtained through raw_input is a string type 16 <type 'str'> 17> help (raw_input) # view raw_input details 18 Help on built-in function raw_input in module _ builtin __: 19 20 raw_input (...) 21 raw_input ([prompt])-> string return value string 22 23 Read a string from standard input. the trailing newline is stripped.24 If the user hits EOF (Unix: Ctl-D, Windows: Ctl-Z + Return), raise EOFError.25 On Unix, GNU readline is used if enabled. the prompt string, if given, 26 is printed without a trailing newline before reading.

 

Print () Format

Print is a statement in python2 and print () is a function in python3.

Format: specify a format and print it out in a certain format,

Create a template, leave some space in a certain part of the template, fill in some content on the space, then these spaces need some symbols to represent, usually called placeholders

% S string placeholder

% D integer placeholder

% F floating point placeholder

3 >>> "I like % s" 4 'I LIKE % s' 5 >>> "I Like % s" % "Python" # Fill % with Python after % s this placeholder 6 'I Like python' 7 >>> a = "I Like % s" 12 >>> a % "java" 13' I Like Java' 14 >>> print "% s was born in % d" % ("tom ", 2018) # The brackets are strings and numbers. 15 tom was born in 201816 >>>

Using braces {} index value placeholder Python {} is recommended {}

Str. format () format

1 >>> s = "I like {0}"2 >>> s.format("Python")3 'I like Python'4 >>> s2 ="%s was born in %d "%("tom",2018)5 >>> s2.format("tom",2018)6 'tom was born in 2018 '