`libcst` is a Concrete Syntax Tree (CST) parser and serializer library for Python.
Questions tagged [libcst]
11 questions
5
votes
1 answer
LibCST: Converting arbitrary nodes to code
Is it possible to dump an arbitrary LibCST node into Python code? My use case is that I want to extract the code for functions that match a specific naming scheme. I can extract the FunctionDef nodes that I need, but I don't seem to find a way to…
Georgios Gousios
- 2,405
- 1
- 24
- 34
4
votes
1 answer
Python Libcst: Unable to generate code from the node in visitor class
I am searching for a way to get code from the node in the visitor.
Example:
import libcst
code_example = """
from ast import parse
threshold = 1
print(threshold)
"""
class CodeVisitor(libcst.CSTVisitor):
def visit_Assign(self, node:…
Nomiluks
- 2,052
- 5
- 31
- 53
2
votes
0 answers
How can I write a Lint rule to prevent Global Variable Mutation in Python?
Global Variables are evil, we all know that (by global variables, I mean module level variables). I want to write a custom lint rule to protect its updation. For example,
GLOBAL_DICT = {
'a': 1,
'b': 2,
}
def func():
var_1 =…
sagar_badiyani
- 21
- 3
2
votes
2 answers
Find if-nodes that are immediately followed by a raise-node in Python with libcst
right now I am working on a project for a university course. I got some random functions and most of them have a if-raise-statement in the code somewhere.
I try to find those, but only those 1 or 2 lines. I transform the functions into an AST and…
Marco
- 33
- 4
1
vote
0 answers
Is there a decode function in libcst to convert a tree to python source code?
I got a piece of output from a sample libcst.parse_module program like:
Module(
body=[
SimpleStatementLine(
body=[
Assign(
targets=[
AssignTarget(
…
shanzhuer
- 11
- 1
1
vote
2 answers
libcst: Inserting new node adds inline code and a semicolon
I am trying to introduce a new node (as a new line of code), exactly before an Assign node.
The issue occurs when using FlattenSentinel to introduce the new node as I want the node to be separate, but libcst concatenates them using a semicolon (;),…
user10728141
- 59
- 1
- 8
0
votes
0 answers
Apply libcst codemod and skip test files
I am writing a codemod with libcst which inherits from VisitorBasedCodemodCommand. It works fine but is rather slow. One simple trick would be to skip all test files which start with test_ by convention. However I haven't been able to find a place…
Martin Faucheux
- 884
- 9
- 26
0
votes
1 answer
How do I distinguish a variable passed as input to a function that's hardcoded, vs a locally defined variable?
If I have:
def my_func(x: str) -> void:
//
def my_caller_func()-> void
local_var = "xyz"
local_var_2 = "zzz"
my_func(x=local_var)
I am trying to write a libcst visitor that will detect that the input value passed into my_func's x input…
user1008636
- 2,989
- 11
- 31
- 45
0
votes
1 answer
Rust compilation errors on installaton of libcst on alpine python
trying to install python modules on alpine linux using 3.7.9 image of alpine-python
Not able to find any solution on how to get the below issues resolved, any assistance would help a lot.
error[E0658]: or-patterns syntax is…
Kiran
- 21
- 5
0
votes
1 answer
Replacing all functions with 'pass', syncing private to public github repo
I'd like to create a repository for a proprietary python module, similarly how this python package mlfinlabs. They have emptied out all functions like this:
def bet_size_dynamic(current_pos, max_pos, market_price, forecast_price,…
semyd
- 430
- 4
- 17
-6
votes
1 answer
How to determine whether a line of Python has a comment, and split the line into `[code, comment]`
I'm wondering how to
determine (True / False) whether a line of Python code has a comment
split the line into code, comment
Something such as:
loc_1 = "print('hello') # this is a comment"
Is very straightforward, but something such as:
loc_2 =…
baxx
- 3,956
- 6
- 37
- 75