String formatting method str.format () function is very powerful, in peacetime applications are more and more, today we look at str.format () method
>>> help(str.format)
Help on method_descriptor:
format(...)
S.format(*args, **kwargs) -> str
Return a formatted version of S, using substitutions from args and kwargs.
The substitutions are identified by braces ('{' and '}').
Help document displayed content is very simple. Here are the specific application of common types of format:
'Hello {}'.format('Word')===>Hello Word
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'你喜欢{2}吗？难道你喜欢{1}，我猜你喜欢{0}'.format('java','c++','python')
===>你喜欢python吗？难道你喜欢c++，我猜你喜欢java
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name='james'
age=12
'我的名字是{}，年龄是{}'.format(name,age)
===>我的名字是james，年龄是12
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'我的名字是{name}，年龄{age}'.format(name='bob',age='30')
===>>我的名字是bob，年龄30
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coord = {'latitude': '37.24N', 'longitude': '-115.81W'}
'Coordinates: {latitude}, {longitude}'.format(**coord)
===>Coordinates: 37.24N, -115.81W
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'{}-{}-{}'.format(*'abc')==>>a-b-c
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'{:*>10}'.format('love you')
#右对齐默认用空格填充，这个例子设置星号填充
===>>**love you
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'{:*^30}'.format('centered')
#居中对齐，默认空格填充，这个例子用性星号填充
===>>>***********centered***********
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'{:*<10}'.format('love you')
#左对齐默认用空格填充，这个例子设置星号填充
=====>>>>love you**
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'{:.4f}; {:.3f};{:f}'.format(3.14, -3.14,3)
#浮点数保留指定位数小数，未指定则默认六位
===>>>3.1400; -3.140;3.000000
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"int: {0:d}; hex: {0:x}; oct: {0:o}; bin: {0:b}".format(42)
#十进制，16进制，八进制，2进制转换
===>>>int: 42; hex: 2a; oct: 52; bin: 101010
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"int: {0:d}; hex: {0:#x}; oct: {0:#o}; bin: {0:#b}".format(42)
#加上#好之后
====>>>int: 42; hex: 0x2a; oct: 0o52; bin: 0b101010
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'{:,}'.format(1234567890)#用逗号作为千位分割符
===》》》1,234,567,890
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points=19
total=22
'{:.2%}'.format(19/22)#表示百分数==>>86.36%
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import datetime
d = datetime.datetime(2010, 7, 4, 12, 15, 58)
st='{:%Y-%m-%d %H:%M:%S}'.format(d)
#格式化时间
==>>>2010-07-04 12:15:58
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octets = [192, 168, 0, 1]
'{:02X}{:02X}{:02X}{:02X}'.format(*octets)
===>>>C0A80001
These are the various methods of the format string, python Some examples cited in official documents.
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