Easy to use pure-python caller signature and line-profiler. Based on Pelletier's pprofile. Visit also the main documentation.

Overview

With Python's standard profiling tools, it is not possible to tell dynamically which function is a hot-spot. On top of that the resulting execution output is not filtered and the information of interest may be difficult to find. Those drawbacks made me start 'bredala' which provide:

• a dynamic API to define which functions/methods to follow:based on the 'New Import Hooks' PEP0302. The declaration has to be done before any processing import.
• a signature mechanism that display the prototype of the called function/method and the corresponding execution time.
• a filtered line-profile to access quickly to the execution time of interest.

Usage

The proposed module display function signatures and by default function line profiles. The latest option can be disabled:

import bredala
bredala.USE_PROFILER = False

At the beginning of your script import the project and select which functions/methods have to be profiled (it must be done before any import):

import bredala
bredala.register("bredala.demo.myfunctions", names=["addition",
                                                    "substraction"])
from bredala.demo.myfunctions import addition, substraction, factorial
addition(2, 1)
substraction(2, 1)
factorial(5)
________________________________________________________________________________
[bredala] Calling bredala.demo.myfunctions.addition...
addition(a=2, b=1)
Line #|      Hits|         Time| Time per hit|      %|Source code
------+----------+-------------+-------------+-------+-----------
    11|         1|  3.69549e-05|  3.69549e-05| 13.15%|def addition(a, b):
    12|         0|            0|            0|  0.00%|    """ Demonstration function.
    13|         0|            0|            0|  0.00%|    """
    14|         1|  5.00679e-05|  5.00679e-05| 17.81%|    return a + b
____________________________________________________________________0.0s, 0.0min
________________________________________________________________________________
[bredala] Calling bredala.demo.myfunctions.substraction...
substraction(a=2, b=1)
Line #|      Hits|         Time| Time per hit|      %|Source code
------+----------+-------------+-------------+-------+-----------
    17|         1|  3.00407e-05|  3.00407e-05| 13.17%|def substraction(a, b):
    18|         0|            0|            0|  0.00%|    """ Demonstration function.
    19|         0|            0|            0|  0.00%|    """
    20|         1|  3.00407e-05|  3.00407e-05| 13.17%|    return a - b
____________________________________________________________________0.0s, 0.0min

It is possible to profile all the functions/methods of a module by removing the optional 'names' argument. In another script:

import bredala
bredala.USE_PROFILER = False
bredala.register("bredala.demo.myfunctions")
bredala.register("bredala.demo.myclasses")
from bredala.demo.myfunctions import addition, substraction, factorial
from bredala.demo.myclasses import Square, Triangle
addition(2, 1)
substraction(2, 1)
factorial(2)
o = Square("my_square")
o.area(2)
o = Triangle("my_square")
o.area(2, 3)
________________________________________________________________________________
[bredala] Calling bredala.demo.myfunctions.addition...
addition(a=2, b=1)
____________________________________________________________________0.0s, 0.0min
________________________________________________________________________________
[bredala] Calling bredala.demo.myfunctions.substraction...
substraction(a=2, b=1)
____________________________________________________________________0.0s, 0.0min
________________________________________________________________________________
[bredala] Calling bredala.demo.myfunctions.factorial...
factorial(a=2)
________________________________________________________________________________
[bredala] Calling bredala.demo.myfunctions.factorial...
factorial(a=1)
____________________________________________________________________0.0s, 0.0min
____________________________________________________________________0.0s, 0.0min
________________________________________________________________________________
[bredala] Calling bredala.demo.myclasses.Square.__init__...
__init__(self=<bredala.demo.myclasses.Square object at 0x7fde3ce049d0>, name='my_square')
____________________________________________________________________0.0s, 0.0min
________________________________________________________________________________
[bredala] Calling bredala.demo.myclasses.Square.area...
area(self=<bredala.demo.myclasses.Square object at 0x7fde3ce049d0>, length_of_side=2)
____________________________________________________________________0.0s, 0.0min
________________________________________________________________________________
[bredala] Calling bredala.demo.myclasses.Triangle.__init__...
__init__(self=<bredala.demo.myclasses.Triangle object at 0x7fde3ce04b50>, name='my_square')
____________________________________________________________________0.0s, 0.0min
________________________________________________________________________________
[bredala] Calling bredala.demo.myclasses.Triangle.area...
area(self=<bredala.demo.myclasses.Triangle object at 0x7fde3ce04b50>, base=2, vertical_height=3)
____________________________________________________________________0.0s, 0.0min

For classes we can select to follow all the methods of a class:

import bredala
bredala.register("bredala.demo.myclasses", names=["Square"])
from bredala.demo.myclasses import Square, Triangle
o = Square("my_square")
o.area(2)
o = Triangle("my_square")
o.area(2, 3)
________________________________________________________________________________
[bredala] Calling bredala.demo.myclasses.Square.__init__...
__init__(self=<bredala.demo.myclasses.Square object at 0x7f26fa000f90>, name='my_square')
Line #|      Hits|         Time| Time per hit|      %|Source code
------+----------+-------------+-------------+-------+-----------
    14|         1|  3.40939e-05|  3.40939e-05| 17.40%|    def __init__(self, name):
    15|         1|  2.69413e-05|  2.69413e-05| 13.75%|        self.name = name
____________________________________________________________________0.0s, 0.0min
________________________________________________________________________________
[bredala] Calling bredala.demo.myclasses.Square.area...
area(self=<bredala.demo.myclasses.Square object at 0x7f26fa000f90>, length_of_side=2)
Line #|      Hits|         Time| Time per hit|      %|Source code
------+----------+-------------+-------------+-------+-----------
    24|         1|  2.09808e-05|  2.09808e-05| 13.19%|    def area(self, length_of_side):
    25|         1|  2.09808e-05|  2.09808e-05| 13.19%|        return length_of_side ** 2
____________________________________________________________________0.0s, 0.0min

Or we can select to follow specific methods:

import bredala
bredala.register("bredala.demo.myclasses", names=["Square.area",
                                                  "Triangle.area"])
from bredala.demo.myclasses import Square, Triangle
o = Square("my_square")
o.area(2)
o = Triangle("my_square")
o.area(2, 3)
________________________________________________________________________________
[bredala] Calling bredala.demo.myclasses.Square.area...
area(self=<bredala.demo.myclasses.Square object at 0x7f52b5c10f90>, length_of_side=2)
Line #|      Hits|         Time| Time per hit|      %|Source code
------+----------+-------------+-------------+-------+-----------
    24|         1|  3.38554e-05|  3.38554e-05| 17.09%|    def area(self, length_of_side):
    25|         1|   2.6226e-05|   2.6226e-05| 13.24%|        return length_of_side ** 2
____________________________________________________________________0.0s, 0.0min
________________________________________________________________________________
[bredala] Calling bredala.demo.myclasses.Triangle.area...
area(self=<bredala.demo.myclasses.Triangle object at 0x7f52b5540790>, base=2, vertical_height=3)
Line #|      Hits|         Time| Time per hit|      %|Source code
------+----------+-------------+-------------+-------+-----------
    31|         1|  2.09808e-05|  2.09808e-05| 12.94%|    def area(self, base, vertical_height):
    32|         1|  2.09808e-05|  2.09808e-05| 12.94%|        return 0.5 * base * vertical_height
____________________________________________________________________0.0s, 0.0min

Perspectives

It will be nice to configure which functions/modules are followed on the fly. It will be nice to add a backend in order to use 'line_profiler' or 'pprofile'.