python check if file exists
import os
os.path.exists("file.txt") # Or folder, will return true or falsepython check if file exists
import os
os.path.exists("file.txt") # Or folder, will return true or falsehow to check whether file exists in python
import os.path
if os.path.isfile('filename.txt'):
print ("File exist")
else:
print ("File not exist")file exist python
import os.path
if os.path.exists('filename.txt'):
print ("File exist")
else:
print ("File not exist")how to check if a string is in a file python
def search_string_in_file(file_name, string_to_search):
"""Search for the given string in file and return lines containing that string,
along with line numbers"""
line_number = 0
list_of_results = []
# Open the file in read only mode
with open(file_name, 'r') as read_obj:
# Read all lines in the file one by one
for line in read_obj:
# For each line, check if line contains the string
line_number += 1
if string_to_search in line:
# If yes, then add the line number & line as a tuple in the list
list_of_results.append((line_number, line.rstrip()))
# Return list of tuples containing line numbers and lines where string is found
return list_of_resultspython with statement file does not exist exception
import os
PATH = './file.txt'
if os.path.isfile(PATH) and os.access(PATH, os.R_OK):
print("File exists and is readable")
else:
print("Either the file is missing or not readable")check if a file exists
>>> import os
>>> os.path.isfile("d:\\Package1\\package1\\fibo.py")
True
>>> os.path.isfile("d:/Package1/package1/fibo.py")
True
>>> os.path.isfile("d:\\nonexisting.txt")Copyright © 2021 Codeinu
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