问题描述
限时送ChatGPT账号..这里的新手很困惑.使用有什么区别:
Confused newbie here. What's the difference between using:
print ("So you are {0} years old".format(age))
和
print ("So you are", age, "years old")
两者都有效.
推荐答案
实际上有很大的不同.前者使用字符串的format
方法来创建一个字符串.后者,将几个参数传递给 print
函数,它将把它们全部连接起来,在它们之间添加一个空格(默认).
Actually there's a huge difference. The former use string's format
method to create a string. The latter, pass several arguments to print
function, which will concatenate them all adding a whitespace (default) between them.
前者要强大得多,例如,您可以使用格式语法 完成以下操作:
The former is far more powerful, for instance, you can use the format syntax to accomplish things like:
# trunc a float to two decimal places
>>> '{:.2f}'.format(3.4567)
'3.46'
# access an objects method
>>> import math
>>> '{.pi}'.format(math)
'3.141592653589793'
它类似于早期版本的python中使用的printf
样式格式,带有%
操作符:(即:"%d"%3
) 现在 str.format()
被推荐用于 %
运算符,并且是 Python 3 中的新标准.
It is similar to printf
style formats used in earlier versions of python with the %
operator: (ie: "%d" % 3
) Now str.format()
is recommended over the %
operator and is the new standard in Python 3.
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