编辑“︁Python F 字符串”︁（章节）

=== 性能测试示例 ===
<syntaxhighlight lang="python">
import timeit

# 使用 % 格式化
time_percent = timeit.timeit('"Name: %s, Age: %d" % ("Alice", 25)', number=100000)

# 使用 str.format()
time_format = timeit.timeit('"Name: {}, Age: {}".format("Alice", 25)', number=100000)

# 使用 f-string
time_fstring = timeit.timeit('f"Name: {"Alice"}, Age: {25}"', number=100000)

print(f"% formatting: {time_percent:.6f}")
print(f"str.format(): {time_format:.6f}")
print(f"f-string: {time_fstring:.6f}")
</syntaxhighlight>
'''输出（示例）：'''
<pre>
% formatting: 0.012345
str.format(): 0.014567
f-string: 0.008901
</pre>