Python中datetime导入冲突引发AttributeError问题求助

我编写了两个Python函数，分别使用不同的datetime调用方式，已知问题出在导入环节但不知如何解决。以下是我的代码：

from datetime import datetime
import datetime
def upload_video(title,description,tags,upload_year,uplaod_month,upload_day):
    upload_date_time = datetime.datetime(upload_year,uplaod_month,upload_day, 8, 00, 0).isoformat() + '.000Z'
    print(f"this is a upload time {upload_date_time}")

    request_body = {
        'snippet': {
            'categoryI': 19,
            'title': title,
            'description': description,
            'tags': tags
        },
        'status': {
            'privacyStatus': 'private',
            'publishAt': upload_date_time,
            'selfDeclaredMadeForKids': False, 
        },
        'notifySubscribers': False
    }

    mediaFile = MediaFileUpload('output.MP4')

    response_upload = service.videos().insert(
        part='snippet,status',
        body=request_body,
        media_body=mediaFile
    ).execute()

def date_calculator():
    days_in_months = {1:31, 2:28, 3:31, 4:30, 5:31, 6:30, 7:31, 8:31, 9:30, 10:31, 11:30, 12:31}

    year = datetime.now().year
    month = datetime.now().month

    # Read the last used date from the text file
    with open("last_used_date.txt", "r") as f:
        last_used_date = f.read().strip()

    # If the file is empty or the date is invalid, set the last used date to the current date
    if not last_used_date or not all(c.isdigit() for c in last_used_date.split(".")):
        last_used_day = datetime.now().day
        last_used_month = month
    else:
        last_used_day, last_used_month = map(int, last_used_date.split(".")[:2])

    # Generate new dates until the next one is greater than the current date
    number = 0
    number_test = 1
    while True:
        date = "{}.{}.{}".format(last_used_day, last_used_month, year)
        number += 1

        if last_used_day == days_in_months[month]:
            last_used_month += 1
            last_used_day = 1 
        else:
            last_used_day += 1

        if number == 2:
            last_used_day += 1
            number = 0

        number_test += 1

        if (last_used_month > month or
            (last_used_month == month and last_used_day > datetime.now().day)):
            with open("last_used_date.txt", "w") as f:
                f.write("{}.{}.{}".format(last_used_day, last_used_month, year))
            break
    return last_used_day,last_used_month,year

当使用上述导入顺序时，报错如下：

Traceback (most recent call last):
File "c:\Users\Lukas\Dokumenty\python_scripts\Billionare livestyle\main.py", line 233, in
day,month,year = date_calculator()
File "c:\Users\Lukas\Dokumenty\python_scripts\Billionare livestyle\main.py", line 162, in date_calculator
year = datetime.now().year
AttributeError: module 'datetime' has no attribute 'now'

当调整导入顺序为import datetime后再from datetime import datetime时，报错如下：

Traceback (most recent call last):
File "c:\Users\Lukas\Dokumenty\python_scripts\Billionare livestyle\main.py", line 235, in
upload_video(title,"#Shorts", ["motivation", "business", "luxury", "entrepreneurship", "success", "lifestyle", "inspiration", "wealth", "financial freedom", "investing", "mindset", "personal development", "self-improvement", "goals", "hustle", "ambition", "rich life", "luxury lifestyle", "luxury brand", "luxury travel", "luxury cars"],year,month,day)
File "c:\Users\Lukas\Dokumenty\python_scripts\Billionare livestyle\main.py", line 74, in upload_video
upload_date_time = datetime.datetime(upload_year,uplaod_month,upload_day, 8, 00, 0).isoformat() + '.000Z'
AttributeError: type object 'datetime.datetime' has no attribute 'datetime'

问题根源 #

你同时混用了from datetime import datetime和import datetime，这两个语句会互相覆盖datetime这个名称，导致调用逻辑混乱：

• 先导入datetime类再导入datetime模块：模块会覆盖类，此时datetime指向模块，而now()是datetime类的方法，模块本身没有这个属性，所以报错。
• 先导入模块再导入类：类会覆盖模块，此时datetime指向datetime.datetime类，再调用datetime.datetime()相当于在类里找datetime属性，自然不存在。

解决办法 #

选一种统一的导入方式，不要混用：

方案1：只导入datetime模块

保留import datetime，删除from datetime import datetime，然后修改函数内的调用：

• date_calculator里的datetime.now() → datetime.datetime.now()
• upload_video里的datetime.datetime(...) 保持不变

修改后的导入和关键调用示例：

import datetime

def date_calculator():
    # ...
    year = datetime.datetime.now().year
    month = datetime.datetime.now().month
    # ...

def upload_video(title,description,tags,upload_year,uplaod_month,upload_day):
    upload_date_time = datetime.datetime(upload_year,uplaod_month,upload_day, 8, 00, 0).isoformat() + '.000Z'
    # ...

方案2：只导入datetime类

保留from datetime import datetime，删除import datetime，然后修改函数内的调用：

• date_calculator里的datetime.now() 保持不变
• upload_video里的datetime.datetime(...) → datetime(...)

修改后的导入和关键调用示例：

from datetime import datetime

def date_calculator():
    # ...
    year = datetime.now().year
    month = datetime.now().month
    # ...

def upload_video(title,description,tags,upload_year,uplaod_month,upload_day):
    upload_date_time = datetime(upload_year,uplaod_month,upload_day, 8, 00, 0).isoformat() + '.000Z'
    # ...

额外提示

代码中upload_video函数存在拼写错误：uplaod_month应该改为upload_month，不修正的话后续运行还会报参数不匹配的错误。

内容的提问来源于stack exchange，提问作者Test000