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Python: compile() function

compile() function

The compile() function is used to compile the source into a code.

The function raises SyntaxError if the compiled source is invalid, and TypeError if the source contains null bytes.

Syntax:

compile(source, filename, mode, flags=0, dont_inherit=False, optimize=-1)

Version:

(Python 3.2.5)

Parameter:

Name Description Required /
Optional
source A normal string, a byte string, or an AST object Required
filename The name of the file file from which the code was read. If it wasn't read from a file, you can give a name yourself Required
mode Either exec or eval or single. Required
flags Controls which future statements affect the compilation of the source. Default Value: 0 Optional
dont-inherit How to compile the source. Default False Optional
optimize Optimization level of the compiler. Default value -1. Optional

Return value:

The filename argument should give the file from which the code was read; pass some recognizable value if it wasn't read from a file ('<string>' is commonly used).

Example: Python compile() function

codeInString = 'x = 8\ny=5\nsum=x+y\nprint("sum =",sum)'
codeObejct = compile(codeInString, 'sumstring', 'exec')
exec(codeObejct)

Output:

sum = 13

Python Code Editor:

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Python: Tips of the Day

Find current directory and file's directory:

To get the full path to the directory a Python file is contained in, write this in that file:

import os 
dir_path = os.path.dirname(os.path.realpath(__file__))

(Note that the incantation above won't work if you've already used os.chdir() to change your current working directory, since the value of the __file__ constant is relative to the current working directory and is not changed by an os.chdir() call.)

To get the current working directory use

import os
cwd = os.getcwd()

Documentation references for the modules, constants and functions used above:

  • The os and os.path modules.
  • The __file__ constant
  • os.path.realpath(path) (returns "the canonical path of the specified filename, eliminating any symbolic links encountered in the path")
  • os.path.dirname(path) (returns "the directory name of pathname path")
  • os.getcwd() (returns "a string representing the current working directory")
  • os.chdir(path) ("change the current working directory to path")

Ref: https://bit.ly/3fy0R6m