问题描述
---
Proj: pgm1
Status: success
summary: 17 passed,17 warnings in 18.73s
---
Proj: pgm2
Status: success
summary: 28 passed,28 warnings in 5.16s
---
Proj: pgm3
Status: Failed
summary: 1 Failed,63 passed,32 warnings in 8.72s
---
并且我需要以写入模式打开它,逐行遍历它,直到找到我想要更改的行(即:pytest 摘要:1 失败,63 次通过,8.72 秒内出现 32 次警告),然后更改该行读取“pytest 摘要:1 失败,63 次通过,8.72 秒内出现 32 次警告”的行,从而修改文件。此外,如果它发现一行格式已经正确(即:pytest summary: 28 passed,28 warnings in 5.16 seconds)忽略它并继续寻找需要修改的行。
这是我修改行的正则表达式:re.sub(r"(\b\d+\.\d+)[a-z]",r"\1 seconds",file_name) #substitutes "8.13s" for "8.13 seconds"
我是 Python 新手,不知道如何修改文件。有人可以告诉我如何使用 file.read()/write() 吗?
我已经尝试过这段代码,但它根本不起作用:
with open(file_path,"r+") as file:
# read the file contents
file_contents = file.read()
re.sub(r"(\b\d+\.\d+)[a-z]",file_contents) #substitutes 8.13s for 8.13 seconds
file.seek(0)
file.truncate()
file.write(file_contents)
---
Proj: pgm1
Status: success
summary: 17 passed,17 warnings in 18.73 seconds
---
Proj: pgm2
Status: success
summary: 28 passed,28 warnings in 5.16 seconds
---
Proj: pgm3
Status: Failed
summary: 1 Failed,32 warnings in 8.72 seconds
---
解决方法
re.sub()
返回更改后的字符串。 file_contents 保持不变。
试试:
with open(file_path,"r+") as file:
# read the file contents
file_contents = file.read()
new_contents = re.sub(r"(\b\d+\.\d+)[a-z]",r"\1 seconds",file_contents) #substitutes 8.13s for 8.13 seconds
file.seek(0)
file.truncate()
file.write(new_contents)