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Have any valid .netrc file. For testing purposes you can use this:
machine abc.xyz login myusername password mypassword
The documentation for netrc.__repr__() states that it "dumps the class data as a string in the format of a netrc file". However, when you try to actually do this, you'll encounter a nasty bug. This can be seen by running the follow commands:
auth = netrc.netrc(os.path.expanduser(r"~\.netrc"))
print(auth.__repr__())
The expected output is:
machine abc.xyz
 login myusername
 password mypassword
The actual output is:
machine abc.xyz
 login 'myusername'
 password 'mypassword'
If you write this back out to the .netrc file, authentication will fail since incorrect username/password (with ' character at beginning at end) will be passed.