以下代码来自教程:
def main():
stri = "Hello, {person}"
stri.format(person="James")
print(stri) #prints "Hello, {person}"
为什么
format()
没有起作用?它是有效的。你只是没有将格式分配给变量,然后只是打印原始字符串。请参见以下示例:
>>> s = 'hello, {person}'
>>> s
'hello, {person}'
>>> s.format(person='james')
'hello, james' # your format works
>>> print s # but you did not assign it
hello, {person} # original `s`
>>> x = s.format(person='james') # now assign it
>>> print x
hello, james # works!