The ast module helps Python applications to process trees of the Python abstract syntax grammar.
Questions tagged [python-ast]
19 questions
13
votes
2 answers
Generate .pyc from Python AST?
How would I generate a .pyc file from a Python AST such that I could import the file from Python?
I've used compile to create a code object, then written the co_code attribute to a file, but when I try to import the file from Python, I get an…
exupero
- 9,136
- 8
- 47
- 63
2
votes
1 answer
Adding visit function to AST visitor prevents other methods from firing
Using the ast module, I run into a weird issue:
Code
import ast
from _ast import Try
code = """
def my_add(a, b):
try:
return a + b
except TypeError:
return a + b
"""
class Visitor(ast.NodeVisitor):
def visit_Try(self,…
Dorian Turba
- 3,260
- 3
- 23
- 67
2
votes
1 answer
ast nodes not preserving some properties (lineno or/and col_offset)
I'm trying to convert every break statement with exec('break') in a code. So far I've got this:
import ast
source = '''some_list = [2, 3, 4, 5]
for i in some_list:
if i == 4:
p = 0
break
exec('d = 9')'''
tree =…
musava_ribica
- 476
- 1
- 5
- 18
2
votes
1 answer
Find end_lineno in ast.ImportFrom
In python 3.8 while doing ast.parse you get a end_lineno variable:
import ast
code_example = 'from typing import List, Dict'
parsed_tree = ast.parse(code_example)
for item in parsed_tree.body:
print(item.__dict__)
Results in:
{
'module':…
ArcLight_Slavik
- 113
- 1
- 10
2
votes
1 answer
Replacing Python Call AST node with Try node
The system I work with allows users to specify a Python Boolean expression as a string (in a configuration file). The system takes the string, converts it to a Python AST object and then evaluates the expression based on input data.
There are…
KyleKnoepfel
- 1,426
- 8
- 24
2
votes
1 answer
Python: what is the ast.FunctionType in python ast?
I don't pretend to have understood everything in python ast, but FunctionType is something that bothered me.
mod = Module(stmt* body, type_ignore *type_ignores)
| Interactive(stmt* body)
| Expression(expr body)
|…
Oussama Hadj Aissa
- 53
- 7
1
vote
1 answer
Print source of lambda without surrounding call
If I define a function
def foo(function):
import inspect
return inspect.getsource(function)
and then call it, I get:
In [11]: foo(lambda x: x[0] + x[1]*2)
Out[11]: 'foo(lambda x: x[0] + x[1]*2)\n'
Note how it printed the entire line,…
ignoring_gravity
- 6,677
- 4
- 32
- 65
1
vote
1 answer
Visiting a assert statement within a functiondef using Python ast
I am currently doing some code manipulation and I am unable to visit an "Assert" statement within a "FunctionDef". How I visit an internal Assert node within a Function node?
Here is a sample code I am modifying
assert True == True
def test_code():
…
Saurabh Misra
- 74
- 6
1
vote
1 answer
Using Python AST Module, parse callables used as arguments
I'm writing a script that will walk through various Python modules, and hunt for instances of calls to fx.bind(). The first argument to this function is a string representing the hotkey, and the second argument is a function that will be run when…
Corin
- 27
- 4
1
vote
2 answers
How do I find the line and column offsets for imported Python modules?
I have a class (based on this answer) that uses ast.NodeVisitor to get a list of modules imported by a Python file. However, I also want to return the line and column offsets for where the module names are located in the file.
Code:
import…
Stevoisiak
- 23,794
- 27
- 122
- 225
1
vote
1 answer
Importing AST modification
I'm attempting dynamic rewrite of pywin32 win32com.client module prior to import, the below seems to work - but I'm not happy with the 6 lines of code for importing (after the last comment). Can anyone recommend a more concise way of creating /…
Christopher Horler
- 71
- 2
- 8
1
vote
1 answer
How does python interpret variable attributes in strings
Suppose I have a string like this
"Style.BRIGHT + 'BRIGHT' + '\\n' + Style.DIM + 'DIM' + '\\n' + Style.NORMAL + 'NORMAL'"
I try to print it directly
from colorama import Style
s = "Style.BRIGHT + 'BRIGHT' + '\\n' + Style.DIM + 'DIM' + '\\n' +…
pppig
- 1,215
- 1
- 6
- 12
1
vote
1 answer
ast - Get the list of only the variable names in an expression
I'm using the Python ast module to obtain a list of variable names in a Python expression. For example, the expression [int(s[i:i + 3], 2) for i in range(0, len(s), 3)] should return a singleton list with the variable name s like [s]. I've tried the…
Shraddha_96
- 11
- 5
1
vote
1 answer
Override functions in exec function
I'm working on a mobile app that can execute Python code easily, and unlike other execution apps I am going to have it run with actual Python.
I'm using a Flask Webserver and requests to accomplish this.
This is my code:
@app.route('/exec')
def…
UCYT5040
- 367
- 3
- 15
0
votes
1 answer
Trying to run current script again causes stack overflow or parserror?
I'm writing a script that will modify the code in the script and rerun it automatically but whichever way I do it, it always goes into repeated output until the kernel restarts and if I keyboard interrupt sometimes I get: ParserError: Error…
Literalomicus
- 33
- 4