python中不受支持的操作数类型

Question

Following is the code I use for taking screenshots using Python (selenium)

path = os.mkdir('D:\screenshots' + time.strftime("%d%m"))
driver.get_screenshot_as_file(path + '\wishlist_' + str(i) + '.jpg')

However when i run this program, I am getting the following error,

Traceback (most recent call last): File "C:\\Users\\me\\Desktop\\domain.py", line 43, in test_bkpdomains

driver.get_screenshot_as_file(path + '\wishlist_' + str(i) + '.jpg')

TypeError: unsupported operand type(s) for +: 'NoneType' and 'str'

Anyone pls help me to overcome this ?

Answer 1

You're trying to concatenate an empty object with a string in the second line.

For example,

import os
path = os.mkdir('dummy')
print path

Returns None so you can't combine that with the strings in the second line. Perhaps if you make the directory and then just use the string for its path in the second line:

path = '/path/to/directory' #string for usage below (can be concatenated)
os.mkdir(path) #make the actual directory 
driver.get_screenshot_as_file(path + '/wishlist_' + str(i) + '.jpg')