CS150 - Final “Cheat Sheet”
1 Input/Output
•Reading input from the user
raw input(message): Displays message to the user and return what the user typed as
a string
•Reading from a file
file = open(filename, "r")
for line in file:
# do something
file.close()
•Writing to a file
–Opening a file for writing:
file = open(filename, "w") # begin writing from the beginning
# or
file = open(filename, "a") # append to the end of the existing contents
–the write method writes strings and other objects to the opened file (without and
carriage return)
•Reading from URLs (e.g. web pages)
import urllib
web_page = urllib.urlopen(some_url)
for line in web_page:
# do something
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