Python几种字符串格式化方法及其性能比较

• Z时代
• 2024-01-10
• 分类：综合

add 0.4576963 # 加号拼接
%-formatting 0.37454160000000014 # % 格式化
str.format 0.44149049999999956 # .format 位置参数
str.format_kw 0.7051137000000001 # .format 关键字参数
f-string 0.2885597000000004 # f字符串

性能最好,且最易用的就是 f字符串

import timeit  
def add():  
    status = 200  
  body = "hello world"  
  return "Status: " + str(status) + "\r\n" + body + "\r\n"  
def old_style():  
    status = 200  
  body = "hello world"  
  return "Status: %s\r\n%s\r\n" % (status, body)  
def formatter1():  
    status = 200  
  body = "hello world"  
  return "Status: {}\r\n{}\r\n".format(status, body)  
def formatter2():  
    status = 200  
  body = "hello world"  
  return "Status: {status}\r\n{body}\r\n".format(status=status, body=body)  
def f_string():  
    status = 200  
  body = "hello world"  
  return f"Status: {status}\r\n{body}\r\n"  
print("add", min(timeit.repeat(lambda: add())))  
print("%-formatting", min(timeit.repeat(lambda: old_style())))  
print("str.format", min(timeit.repeat(lambda: formatter1())))  
print("str.format_kw", min(timeit.repeat(lambda: formatter2())))  
print("f-string", min(timeit.repeat(lambda: f_string())))

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