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Python Articles
Page 832 of 855
How to encapsulate Python modules in a single file?
You cannot, in general encapsulate Python modules in a single file. Because doing so would destroy the module searching method that python uses (files and directories). If you are not able to install modules on a machine(due to not having enough permissions), you could use either virtualenv or save the module files in another directory and use the following code to allow Python to search for modules in the given module:>>> import os, sys >>> file_path = 'AdditionalModules/' >>> sys.path.append(os.path.dirname(file_path)) >>> # Now python also searches AdditionalModules folder for importing modules as we have set it on the PYTHONPATH.You can ...
Read MoreHow do I find the location of Python module sources?
For a pure python module you can find the location of the source files by looking at the module.__file__. For example, >>> import mymodule >>> mymodule.__file__ C:/Users/Ayush/mymodule.py Many built in modules, however, are written in C, and therefore module.__file__ points to a .so file (there is no module.__file__ on Windows), and therefore, you can't see the source. You can manually go and check the PYTHONPATH variable contents to find the directories from where these built in modules are being imported. Running "python -v"from the command line tells you what is being imported and from where. This is useful if you want to ...
Read MoreWhat are the differences between json and simplejson Python modules?
json is simplejson, added to the stdlib. But since json was added in 2.6, simplejson has the advantage of working on more Python versions (2.4+).simplejson is also updated more frequently than Python. Although they are the same, the version included in the stdlib doesn't include the latest optimizations. So if you need (or want) the latest version, it's best to use simplejson itself, if possible.A good practice, is to use one or the other as a fallback. For example,try: import simplejson as json except ImportError: import json
Read MoreHow to check version of python modules?
When you install Python, you also get the Python package manager, pip. You can use pip to get the versions of python modules. If you want to list all installed Python modules with their version numbers, use the following command:$ pip freezeYou will get the output:asn1crypto==0.22.0 astroid==1.5.2 attrs==16.3.0 Automat==0.5.0 backports.functools-lru-cache==1.3 cffi==1.10.0 ...To individually find the version number you can grep on this output on *NIX machines. For example:$ pip freeze | grep PyMySQL PyMySQL==0.7.11On windows, you can use findstr instead of grep. For example:PS C:\> pip freeze | findstr PyMySql PyMySQL==0.7.11If you want to know the version of a module ...
Read MoreHow do I unload (reload) a Python module?
The function reload(moduleName) reloads a previously loaded module (assuming you loaded it with the syntax "importmoduleName" without exiting the script. It is intended for conversational use, where you have edited the source file for a module and want to test it without leaving Python and starting it again. For example, >>> import mymodule >>> # Edited mymoduleand want to reload it in this script >>> reload(mymodule)Note that the moduleName is the actual name of the module, not a string containing its name. The python docs state following about reload function: Python modules’ code is recompiled and the module-level code re-executed, defining ...
Read MoreHow to set your python path on Linux?
To set the PYTHONPATH on Linux to point Python to look in other directories for the module and package imports, export the PYTHONPATH variable as follows:$ export PYTHONPATH=${PYTHONPATH}:${HOME}/fooIn this case, are adding the foo directory to the PYTHONPATH. Note that we are appending it and not replacing the PYTHONPATH's original value. In most cases, you shouldn't mess with PYTHONPATH. More often than not, you are doing it wrong and it will only bring you trouble.
Read MoreHow to set your python path on Mac?
To set the PYTHONPATH on Mac OS to point Python to look in other directories for module and package imports, export the PYTHONPATH variable as follows:$ export PYTHONPATH=${PYTHONPATH}:${HOME}/foo In this case are adding the foo directory to the PYTHONPATH. Note that we are appending it and not replacing the PYTHONPATH's original value. In most cases, you shouldn't mess with PYTHONPATH. More often than not, you are doing it wrong and it will only bring you trouble
Read MoreHow to set your python path on Windows?
To set the PYTHONPATH on windows to point Python to look in other directories for module and package imports, go to:My Computer > Properties > Advanced System Settings > Environment VariablesThen under system variables edit the PythonPath variable. At the end of the current PYTHONPATH, add a semicolon and then the directory you want to add to this path:C:\Python27;C:\fooIn this case, are adding the foo directory to the PYTHONPATH. Note that we are appending it and not replacing the PYTHONPATH's original value. In most cases, you shouldn't mess with PYTHONPATH. More often than not, you are doing it wrong and ...
Read MoreHow to replace with in Python?
There are two ways to go about replacing \ with \ or unescaping backslash escaped strings in Python. First is using literal_eval to evaluate the string. Note that in this method you need to surround the string in another layer of quotes. For example:>>> import ast >>> a = '"Hello,world"' >>> print ast.literal_eval(a) Hello, worldAnother way is to use the decode('string_escape') method from the string class. For example,>>> print "Hello,world".decode('string_escape') Hello, world
Read MorePython program to find the most occurring character and its count
In this article, we will learn about the solution and approach to solve the given problem statement.Problem statementGiven an input string we need to find the most occurring character and its count.ApproachCreate a dictionary using Counter method having strings as keys and their frequencies as values.Find the maximum occurrence of a character i.e. value and get the index of it.Now let’s see the implementation below −Examplefrom collections import Counter def find(input_): # dictionary wc = Counter(input_) # Finding maximum occurrence s = max(wc.values()) i = wc.values().index(s) print (wc.items()[i]) # Driver program if __name__ ...
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