Python compile() Function with Examples

Python / By

In the previous article, we have discussed Python Program for bytes() Function
compile() Function in Python:

The compile() function returns the specified source as a ready-to-execute code object.

Syntax:

compile(source, filename, mode, flag, dont_inherit, optimize)

Parameters:

source: This is Required. A String, a Bytes object, or an AST object can be used as the source to compile.

filename: Required. The name of the file from which the source was obtained. If the source is not a file, you can type whatever you want.

mode: This is Required. Legal principles:

  • If the source is a single expression, use eval.
  • If the source is a set of statements, use exec.
  • If the source is a single interactive statement, use single

flag: This is Optional. The process of compiling the source code. 0 is the default.

dont_inherit: This is Optional. The process of compiling the source code. False by default

optimize: This is Optional. Defines the compiler’s optimization level. -1 is the default.

Return value:

Python code object is returned by the compile() function.

Examples:

Example1:

Input:

Given code in string = 'p = 4\nq=7\nmult=p*q\nprint("The multiplication result =",mult)'

Output:

The multiplication result = 28

Example2:

Input:

Given code in string = 'p = 25\nq=5\ndivisn=p/q\nprint("The division result =",divisn)'

Output:

The division result = 5.0

Program for compile() Function in Python

Method #1: Using Built-in Functions (Static Input)

Approach:

  • Give the Python code as a string that multiplies the given two numbers and store it in a variable.
  • Compile the given code using the compile() function with the parameters as the above string code, codename, and mode of compilation.
  • Print the above result which is the code after compilation.
  • The Exit of the Program.

Below is the implementation:

# Give the Python code as a string that multiplies the given two numbers
# and store it in a variable.
codeIn_gvnstring = 'p = 4\nq=7\nmult=p*q\nprint("The multiplication result =",mult)'
# Compile the given code using the compile() function with the parameters
# as the above string code, codename, and mode of compilation.
code_obejct = compile(codeIn_gvnstring, 'multstring', 'exec')
# Print the above result which is the code after compilation.
exec(code_obejct)

Output:

The multiplication result = 28

Explanation:

In this case, the source is a regular string. multstring is the filename. Furthermore, the exec mode later allows the use of the exec() method.

The compile() method transforms a string into a Python code object. The exec() method is then used to execute the code object.

Find a Comprehensive Collection of Python Built in Functions that you need to be aware of and use them as a part of your program.