f-string 句法和 format() 方法 性能比较


f-string 句法可用于格式化字符串文字,由 CPython 3.6 引入。

性能比较


f-string 采用 f 或 F 作前缀,与 + 操作内置符和 format() 方法的性能比较如下:

from datetime import datetime
start = datetime.now()
count = 2000000
while count:
    count -= 1
    a = "str" + "ing"
    b = a + " test"
print(datetime.now() - start)
 
start = datetime.now()
count = 2000000
while count:
    count -= 1
    a = "{}ing".format("str")
    b = "{} test".format(a)
print(datetime.now() - start)
 
start = datetime.now()
count = 2000000
while count:
    count -= 1
    string = "str"
    a = f"{string}ing"
    b = f"{a} test"
print(datetime.now() - start)
					

by Digital IDE 运行调试, 获取以下结果。

0:00:01.061802
0:00:02.948405
0:00:01.809603
					

其中 + 内置操作符用时最少,但必须是 str 对象类型;f-string 句法次之,format() 最慢。

See also:

% Operator

Format String Syntax

Format String Literal

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