python开辟_python中str.format()

    添加时间:2013-7-27 点击量:

    格局化一个字符串的输出成果,我们在很多处所都可以看到,如:c/c++中都有见过


    下面看看python中的字符串格局函数str.format():



     1 应用str.format()函数
    
    2
    3 应用{}占位符
    4 printI\m {},{}.format(HongtenWelcome to my space!))
    5
    6 print 40
    7
    8 也可以应用{0},{1}情势的占位符
    9 print{0},I\m {1},my E-mail is {2}.format(HelloHongtenhongtenzone@foxmail.com))
    10 可以改变占位符的地位
    11 print{1},I\m {0},my E-mail is {2}.format(HongtenHellohongtenzone@foxmail.com))
    12
    13 print 40
    14
    15 应用{name}情势的占位符
    16 printHi,{name},{message}.format(name = Tom,message = How old are you?))
    17
    18 print 40
    19
    20 混淆应用{0},{name}情势
    21 print{0},I\m {1},{message}.format(HelloHongten,message = This is a test message!))
    22
    23 print 40
    24
    25 下面进行格局把握
    26 import math
    27 printThe value of PI is approximately {}..format(math.pi))
    28 printThe value of PI is approximately {!r}..format(math.pi))
    29 printThe value of PI is approximately {0:.3f}..format(math.pi))
    30
    31
    32 table = {Sjoerd: 4127, Jack: 4098, Dcab: 7678}
    33 for name, phone in table.items():
    34 print{0:10} ==> {1:10d}.format(name, phone))
    35
    36
    37 table = {Sjoerd: 4127, Jack: 4098, Dcab: 8637678}
    38 printJack: {0[Jack]:d}; Sjoerd: {0[Sjoerd]:d}; Dcab: {0[Dcab]:d}.format(table))


    运行结果:



    Python 3.3.2 (v3.3.2:d047928ae3f6, May 16 2013, 00:03:43) [MSC v.1600 32 bit (Intel)] on win32
    
    Type
    copyrightcredits or license() for more information.
    >>> ================================ RESTART ================================
    >>>
    I
    m Hongten,Welcome to my space!
    #######################################
    Hello,Im Hongten,my E-mail is hongtenzone@foxmail.com
    Hello,Im Hongten,my E-mail is hongtenzone@foxmail.com
    #######################################
    Hi,Tom,How old are you?
    #######################################
    Hello,Im Hongten,This is a test message!
    #######################################
    The value of PI is approximately 3.141592653589793.
    The value of PI
    is approximately 3.141592653589793.
    The value of PI
    is approximately 3.142.
    Jack
    ==> 4098
    Sjoerd
    ==> 4127
    Dcab
    ==> 7678
    Jack:
    4098; Sjoerd: 4127; Dcab: 8637678
    >>>

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