文件内容替换

# fileName 文件名

# oldStr 源字符串

# newStr 新字符串

def fileContentAlter(fileName,oldStr,newStr):
　　file_data = ""
　　with open(fileName,"r",encoding="utf-8") as f:
　　for line in f:
　　　　line = line.replace(oldStr,newStr)
　　　　file_data += line
　　with open(fileName,"w",encoding="utf-8") as f:
　　　　f.write(file_data)