试图写入一个文件，但我得到一个错误，说写需要一个文件对象而不是一个字符串

Question

感谢所有的反馈，现在错误已修复。

我想用这段代码写入一个文件。

import datetime 
from datetime import datetime 
ctime = str(datetime.now()) 
try: 
    open("pyth_log.txt", "w") 
    file.write("pyth_log.txt") 
    file.write("-------") 
    file.write("LOG") 
    file.write(ctime) 
    file.write("-------") 
    file.close() 
except: 
    print("Unable to open file") 
    raise 

错误，我得到：

TypeError: descriptor 'write' requires a 'file' object but received a 'str' 

我也试图与 “pyth_log.txt” 不加引号，但随后给我的错误运行代码：

NameError: name 'pyth_log' is not defined 

Answer 1

您错过了将文件指针分配给文件变量 试试这个

from datetime import datetime 
ctime = str(datetime.now()) 
try: 
    with open("pyth_log.txt", "w") as file: 
     file.write("pyth_log.txt") 
     file.write("-------") 
     file.write("LOG") 
     file.write(ctime) 
     file.write("-------") 
except: 
    print("Unable to open file") 

Answer 2

为了使用write()方法，您必须与文件对象一起使用。此外，最好是使用with open()语法上调用close()的范围将被丢弃时with结束：

import datetime 
from datetime import datetime 
ctime = str(datetime.now()) 
try: 
    with open("pyth_log.txt", 'w') as f: 
     file.write("pyth_log.txt\n" 
        "-------\n" 
        "LOG\n" 
        + ctime + "\n" 
        "-------") 
except: 
    print("Unable to open file") 
    raise 

Answer 3

from datetime import datetime 

ctime = str(datetime.now()) 
try: 
    with open("pyth_log.txt", "w") as file: 
     file.write("-------\n") 
     file.write("LOG\n") 
     file.write(ctime) 
     file.write("\n-------\n") 
except: 
    print("Unable to open file") 
    raise