fun-with-ast 0.1.68

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Fun with ASTs

Provides developers with a programmatic tool to change our own code. This repository contains a library to analyze and manipulate python code using Abstract Systax Tress manipulation.

Using the library

See the test-fun-with-ast project for examples of using the fun-with-ast library.

Why Fun with ASTs

1. The intellectual problem:
2. it is fun
3. it is a great learning experience
4. enables smart and complex manipulations

How it works

AST Parse and Unparse Examples

example #1: losing comments

import ast
code = """
a=7 # A is 7
"""  
print(ast.unparse(ast.parse(code)))

Output:

a = 7 

example #2: Losing parentheses

import ast
code ="""
if (a<7) or (b>9):
    pass
"""
print(ast.unparse(ast.parse(code)))

Output:

if a < 7 or b > 9:
    pass

Example 3: Losing elif, losing indentation

import ast
code = """
if True:  
  a=2
else:
  if d==8:
    c=7
"""
print(ast.unparse(ast.parse(code)))

output:

if True:
    a = 2
elif d == 8:
    c = 7

import ast
print(ast.unparse(ast.parse("""if True:\n  a=2\nelse:\n  if d==8:\n    c=7\n  else:\n    c =8""")))
if True:
    a = 2
elif d == 8:
    c = 7
else:
    c = 8

example #1

import ast
code = """
if True:
   a=2
else:
  if d==8:
    c = 7
  elif d==9:
    c=8"""   
print(ast.unparse(ast.parse(code)))

``python if True: a = 2 elif d == 8: c = 7 elif d == 9: c = 8

## examples
### Fun #1: Keep source to source transformations
### Fun #2: add log
### Fun #3: switch else / if 
### Fun #4: mutation testing switch `<` into `<=`
### Fun #5: for to while 
### Fun #6: for loop into tail recursion 
### Fun #7: Add node AND comment 
### Fun #8: Sort methods public to private






# Get started