Python 學習筆記（七）Python字串（四），學習筆記python

Python 學習筆記（七）Python字串（四），學習筆記python

輸入輸出

 輸入函數 raw_input (Python3:input)

 1 >>> raw_input("請輸入一個字母") #擷取輸入內容的一個函數 2 請輸入一個字母A 3 'A' 4 >>> 5 >>> name = raw_input("Please input your name:") #輸入得內容賦值給一個變數 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)  #通過raw_input 得到的結果是一個字串類型16 <type 'str'>17 >>> help(raw_input) #查看raw_input詳細內容18 Help on built-in function raw_input in module __builtin__:19 20 raw_input(...)21     raw_input([prompt]) -> string   傳回值字串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()格式化

print 在python2中是一個語句 ，在python3中print() 是一個函數

格式化   指定一種格式，按照某種格式列印出來,

　　　　制定一種模板,在模板中某個地方留出一些空位，在空位上填上某些內容，那麼這些空位就需要一些符號來表示，通常稱之為預留位置

%s  字串預留位置

%d  整數預留位置

%f  浮點數預留位置

 3 >>> "I LIKE %s" 4 'I LIKE %s' 5 >>> "I Like %s"%"Python"  #用%之後的Python 來填充%s這個預留位置 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)  #括弧中為字串和數字15 tom was born in 201816 >>>

用花括弧{}索引值 預留位置 Python 推薦使用  {} 

　　 str.format() 格式化

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 '