TypeError：不支持的操作数类型为+：'NoneType'和'str'使用GITPYTHON

Question

我正在使用gitpython来做一些文件处理。一切工作正常，除了d.new_file条件，我遇到这种类型的错误，我不能连接NoneType和str在一起。

我认为d.a_path是无，但我不明白为什么它不工作，但它在其他条件下工作。

for d in repo.head.commit.diff(None,create_patch=True): 
    if d.deleted_file: 
     print("deleted file") 

    elif d.new_file: 
     print(" new_file") 

     with open(main_dir,'a+') as main_file: 
      main_file.write(d.a_path +'\n') 

    elif d.renamed_file: 
     print("renamed file") 

    else: 
     print(" modified file") 

     with open(main_dir,'a') as main_file: 
      main_file.write(d.a_path+"\n") 

     handle_diff(d.diff) 

有人知道为什么d.a_path为None为d.new_file条件？

Answer 1

这是documented behaviour：

There are a few cases where None has to be expected as member variable value:

New File:

a_mode is None 
a_blob is None 
a_path is None

Deleted File:

b_mode is None 
b_blob is None 
b_path is None

新文件的路径应该是b_path一个新的文件，而不是在a_path，因为文件并未a存在。