Python Package

• Python Package
  • 1 example

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Python Package

main.py
mypackage/
    __init__.py
    mymodule.py
    myothermodule.py

…a mymodule.py like this…

#!/usr/bin/env python3

# Exported function
def as_int(a):
    return int(a)

# Test function for module
def _test():
    assert as_int('1') == 1

if __name__ == '__main__':
    _test()

1 example

• main.py: good

#!/usr/bin/env python3

from mypackage.myothermodule import add

def main():
    print(add('1', '1'))

if __name__ == '__main__':
    main()

• myothermodule.py: fail

#!/usr/bin/env python3

from .mymodule import as_int

# Exported function
def add(a, b):
    return as_int(a) + as_int(b)

# Test function for module
def _test():
    assert add('1', '1') == 2

if __name__ == '__main__':
    _test()

• The way you’re supposed to run it is…
• python3 -m mypackage.myothermodule

solution:

• assuming the name mymodule is globally unique
  • would be to avoid using relative imports, and just use…
  • from mymodule import as_int
• if it’s not unique, or your package structure is more complex,
  • include the directory containing your package directory in PYTHONPATH, and do it like this…
  • from mypackage.mymodule import as_int

.