modules in python

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Modular programming

As you are programming, the software can quickly scale into a large code base.   To manage complexity we can use classes, functions and modules.


Module content

To show the accessible functions (and included variables) in a module, you can use this code:
#!/usr/bin/env python
import sys
 
print(dir(sys))
Result:

['__displayhook__', '__doc__', '__egginsert', '__excepthook__', '__name__', '__package__', '__plen', '__stderr__', '__stdin__', 
'__stdout__', '_clear_type_cache', '_current_frames', '_getframe', '_mercurial', '_multiarch', 'api_version', 'argv', 
'builtin_module_names', 'byteorder', 'call_tracing', 'callstats', 'copyright', 'displayhook', 'dont_write_bytecode', 
'exc_clear', 'exc_info', 'exc_type', 'excepthook', 'exec_prefix', 'executable', 'exit', 'flags', 'float_info', 'float_repr_style'
, 'getcheckinterval', 'getdefaultencoding', 'getdlopenflags', 'getfilesystemencoding', 'getprofile', 'getrecursionlimit', 
'getrefcount', 'getsizeof', 'gettrace', 'hexversion', 'long_info', 'maxint', 'maxsize', 'maxunicode', 'meta_path', 'modules', 
'path', 'path_hooks', 'path_importer_cache', 'platform', 'prefix', 'py3kwarning', 'pydebug', 'setcheckinterval', 'setdlopenflags'
, 'setprofile', 'setrecursionlimit', 'settrace', 'stderr', 'stdin', 'stdout', 'subversion', 'version', 'version_info', 
'warnoptions']


Create a file called test.py (your module)

#!/usr/bin/env python
 
def add(a,b):
    return a+b
Then create a file called app.py:

from test import *
 
print('hello')
print(add(5,2))



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