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Execute a String of Code in Python

Using C codes in Python | Set 2

Last Updated : 18 Mar, 2019

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Prerequisite: Using C codes in Python | Set 1

In the previous article, we have discussed how to access C code in Python. Now, let’s see how to access C functions.

Code #1 : Accessing C functions with Python

   import work 
  
print ("GCD : ", work.gcd(35, 42)) 
  
print ("\ndivide : ", work.divide(42, 8)) 
  
print ("\navg : ", work.avg([1, 2, 3])) 
  
p1 = work.Point(1, 2) 
p2 = work.Point(4, 5) 
print ("\ndistance : ", work.distance(p1, p2))

Output :

  GCD : 7    divide : (5, 2)    avg : 2.0    distance : 4.242640687119285

Issue ?
Now the work done above has an issue that for the overall packaging of C and Python code together, using ctypes to access C code that has been compiled, one has to make sure that the shared library gets placed in a location, where the work.py module can find it. One possibility is to put the resulting libsample.so file in the same directory as the supporting Python code.

So, if the C library is installed elsewhere, then path has to be adjusted accordingly. If it is installed as a standard library on the machine, then ctypes.util.find_library() function can be used.

Code #2 : Path Example

   from ctypes.util import find_library 
  
find_library('m') 
  
find_library('pthread') 
  
find_library('sample')

Output :

  /usr/lib/libm.dylib    /usr/lib/libpthread.dylib    /usr/local/lib/libsample.so

Again, ctypes won’t work at all if it can’t locate the library with the C code. ctypes.cdll.LoadLibrary() is used to load the C library, once it’s location is known.

_mod = ctypes.cdll.LoadLibrary(_path)

Execute a String of Code in Python

M

manikachandna97

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Article Tags :

Python
python-utility

Practice Tags :

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