static analysis without a file

Question

I some 300,000 snippets of code, submitted by 700 students, which I have imported into a pandas data frame.

My goal is to run static analysis on all of these codes to find out what sort of errors they are facing. And I'm trying to do it without having to write these to actual files (300k files).

things I have tried :

directly calling pylint on data frame item

pl.run_pylint(['--errors-only',dt.iloc[0][0]])

and output is

    ************* Module number = int(input('Please enter a number: '));

if number < 0 {
    print(number*-1);
} else {
    print(number);
}
number = int(input('Please enter a number: '));

if number < 0 {
    print(number*-1);
} else {
    print(number);
}:1:0: F0001: No module named number = int(input('Please enter a number: '));

if number < 0 {
    print(number*-1);
} else {
    print(number);
} (fatal)
An exception has occurred, use %tb to see the full traceback.

SystemExit: 1

whereas if I output the dataFrame content to a file, and run

pl.run_pylint(['--errors-only','test.py'])

the output is

************* Module test
test.py:1:15: E0001: invalid syntax (<unknown>, line 1) (syntax-error)
An exception has occurred, use %tb to see the full traceback.

SystemExit: 2

I'm actually out of ideas. Any help is greatly appreciated!!

Answer 1

I guess that is possible to run pylint programatically (eg. using run_pylint method), but under the hood pylint using subprocess to re-run lint as external command, so I used same way to run pylint as external command:

from subprocess import run, PIPE

bad_code = '''
def a(a    =       1):
 print(       a     )
'''

result = run(['pylint', '--from-stdin', 'dummy.py'], input=bad_code.encode(), stdout=PIPE, stderr=PIPE)

print('STDOUT ------------------')
print(result.stdout.decode("utf8"))
print('STDERR ------------------')
print(result.stderr.decode("utf8"))

We call pylint as external command with --from-stdin parameter to be able read file contents from stdin.
dummy.py may be any free filename

Output is:

STDOUT ------------------
************* Module dummy
dummy.py:3:21: C0303: Trailing whitespace (trailing-whitespace)
dummy.py:3:0: W0311: Bad indentation. Found 1 spaces, expected 4 (bad-indentation)
dummy.py:1:0: C0114: Missing module docstring (missing-module-docstring)
dummy.py:2:0: C0103: Function name "a" doesn't conform to snake_case naming style (invalid-name)
dummy.py:2:6: C0103: Argument name "a" doesn't conform to snake_case naming style (invalid-name)
dummy.py:2:0: C0116: Missing function or method docstring (missing-function-docstring)
dummy.py:2:6: W0621: Redefining name 'a' from outer scope (line 2) (redefined-outer-name)

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STDERR ------------------