How I can save the output in a text file

Question

I use the library TextRazor to analyze a text and save it in a text file but when I open the file it's empty

import os 
textrazor.api_key = ""
client = textrazor.TextRazor(extractors=["word","entities", "topics","sentence","words"])
response = client.analyze("Twenty-four isolates (60%) were associated with pneumonia, 14 (35%) with upper respiratory tract infections, and 2 (5%) with bronchiolitis. Cough (82.5%), fever (75%), and malaise (58.8%) ")
for entity in response.entities():
    print(entity.id, entity.relevance_score, entity.confidence_score, entity.freebase_types)
cmd = os.popen('ls -w').read() # Récupération de la sortie de ls -a dans la variable cmd
print(cmd) # Affichage de la sortie
with open('monfichier.txt', 'w') as file:
        s=str(cmd)
        file.write(s)

Answer 1

ls -w is not a valid command as an integer is needed after the -w . Furthermore, do not use os.popen : it is not portable. Use the Python API instead (see os.walk ).