In Python3, does `import` work transitively?

Question

In Python3, does import work transitively?

For example, if a module contains import A, and the module for A contains import B, then does the module import B indirectly?

Compared to other languages:

• In Java, some said that import doesn't work transitively, see https://stackoverflow.com/a/46677664.

• in C, include does work transitively. For example, if a file contains #include "A.h", and A.h contains #include "B.h", then the file also includes B.h indirectly.

How do Python's import, Java's import, and C'sinclude` work under the hook to have differences?

Thanks.

Answer 1

When you're importing a module to your namespace, Python creates a module namespace. This goes recursively; when you import A, it will import B and if it fails you'll get an error. Otherwise it will be accessible through A.B

# temp.py
def func_in_b():
    print 'this is B'

# temp2.py
import temp

def func_in_a():
    print 'this is A'

>>> import temp2
>>> temp2.func_in_a()
this is A
>>> temp2.temp.func_in_b()
this is B