listdir("/"): ['subdir']
listdir("."): ['subdir']
getcwd() in {"", "/"}: True
chdir("subdir"): None
getcwd(): /subdir
mkdir("two"): None
listdir("/"): ['subdir']
listdir("/subdir"): ['file.py', 'one', 'two']
listdir("."): ['file.py', 'one', 'two']
print('hello')
hello
<module 'file' from 'file.py'>
chdir("/mnt/dir"): None
getcwd(): /mnt/dir
chdir("/mnt"): None
getcwd(): /mnt
chdir("/"): None
getcwd(): /
chdir("/mnt/dir"): None
getcwd(): /mnt/dir
chdir(".."): None
getcwd(): /mnt
False