python format函數(shù)

python format函數(shù)的用法是什么呢？不知道的小伙伴來看看小編今天的分享吧!

python format函數(shù)用法詳解：

1、位置

print("hello {0}, this is {1}.".format("world", "python"))  # 根據(jù)位置下標(biāo)進(jìn)行填充

print("hello {}, this is {}.".format("world", "python"))  # 根據(jù)順序自動填充

print("hello {0}, this is {1}. {1} is a new language.".format("world", "python"))  # 同一參數(shù)可以填充多次

輸出：

hello world, this is python.

hello world, this is python.

hello world, this is python. python is a new language.

2、key

obj = "world"

name = "python"

print("hello {obj}, this is {name}.".format(obj = obj, name = name))

輸出：

hello world, this is python.

3、列表

list = ["world", "python"]

print("hello {names[0]}, this is {names[1]}.".format(names = list))

輸出：

hello world, this is python.

4、字典

dict = {"obj":"world", "name":"python"}

print("hello {names[obj]}, this is {names[name]}.".format(names = dict))

輸出：

hello world, this is python.

注意：

訪問字典的 key，不用引號。

5、類屬性

class Names():

    obj = "world"

    name = "python"

print("hello {names.obj}, this is {names.name}.".format(names = Names))

輸出：

hello world, this is python.

6、魔法參數(shù)

args = [",", "inx"]

kwargs = {"obj": "world", "name": "python"}

print("hello {obj}{} this is {name}.".format(*args, **kwargs))

輸出：

hello world, this is python.

注意：

這里的 format(*args, **kwargs) 等價于 format(",", "inx", obj = "world", name = "python")。

二、數(shù)字格式化

三、其他用法

1、轉(zhuǎn)義

print("{{hello}} {{{0}}}".format("world"))

輸出：

{hello} {world}

2、format 作為函數(shù)變量

name = "python"

hello = "hello, welcome to {} world!".format

print(hello(name))

輸出：

hello, welcome to python world!

3、格式化 datatime

from datetime import datetime

now = datetime.now()

print("{:%Y-%m-%d %X}".format(now))

輸出：

2020-12-15 19:46:24

4、{}內(nèi)嵌{}

print("hello {0:>{1}} ".format("world", 10))

輸出：

hello      world

以上就是小編今天的分享了，希望可以幫助到大家。

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