Read/write file

import sys

# Read
with open('../first.js', 'r') as reading_file:
    remove_newlines = lambda x: x.replace('\n', '')
    lines = list(reading_file)
    formatted_lines = [remove_newlines(line) for line in lines]

# Write
with open('output_file', 'w') as output_file:
    for line in lines:
        output_file.write(line)

or

with open('output_file', 'w') as output_file:
    output_file.writelines(lines)

Standard input/output read and write

#### Write to stdout
import sys
sys.stdout.write(str(last_answer ))

or

import sys
with sys.stdout as stdout:
    sdout.write(str(last_answer))

Read from stdin

import sys
with sys.stdin as stdin:
    remove_newlines = lambda x: x.replace('\n', '')
    lines = [remove_newlines(line) for line in stdin]

or

lines = sys.stdin.readlines()

Remove trailing and beginning newlines from string

remove_newlines = lambda x: x.trim('\r\n')

Gzip

read compressed file

import gzip
with gzip.open('file.txt.gz', 'rb') as f:
    file_content = f.read()

compress file

import gzip
content = "Lots of content here"
with gzip.open('file.txt.gz', 'wb') as f:
    f.write(content)

Misc

Blink led of caps key

import fcntl,os,time;
exec "fcntl.ioctl(os.open('/dev/console',os.O_NOCTTY),19250,%d);time.sleep(.5);"*2%(4,0)