python how to see files in a certain directory code example

Example 1: python list files in current directory

import os

files = os.listdir('.')
print(files)
for file in files:
  # do something

Example 2: python find file in directory

# option A (i think this is faster, not in micropython)

import os

if os.path.isfile("test.dat"):
	print("yes") #file found
else:
	print("no") #file not found

# also this is posible
# from os.path import isfile
# if isfile("test.dat"):


# option B (posible in micropython)

import os

if "test.dat" in os.listdir():
	print("yes") # file found
else:
	print("no") # file not found

# os.lisdir() return a array whit all the files found in the directory