# Favorite Python One-liners

May 21, 2015

So, these are not really one-liners as much as they are useful snippets of code I seem to always use or always look for. Feel free to add your own in the comments.

## Decode base64 File

```import base64, sys;
base64.decode(open(sys.argv[1], "rb"), open(sys.argv[2], "wb"))```

## Sum Numbers

`print sum(range(1,100))`

## Min and Max

```print min([1, 5, 2, -1, 0])
print max([1, 5, 2, -1, 0])```

## Cache Function Results for Faster Performance (Decorators)

You've got some extra work on your hands if you want to use this before Python 3.2.3.

```import functools

@functools.lru_cache(maxsize=None)
def fib(n):
return 1 if n < 2 else fib(n-1) + fib(n-2)

print fib(5)```

```x = 1
y = 2
x, y = y, x
print x
print y```

## Interate Over 2 Lists in 1 Loop

```list1 = ["apples", "oranges"]
list2 = ["bag", "bucket"]

for a, b in zip(list1, list2):
print a + " are in a " + b```

## Hackery with FizzBuzz

```for x in range(1,101):
print "Fizz" [x%3*4:] + "Buzz" [x%5*4:] or x```

## Write to File

```with open('foo.txt', 'w') as f:
f.write('hello world')```

## Read File Lines Into Array Stripped

`lines = [line.strip() for line in open('foo.txt')]`

## Evaluate a String as as Python

```expression = "[1, 2, 3, 4, 5]"
list = eval(expression)
print list```

## Set a Breakpoint in Your Script

Just call pdb.set_trace() anywhere in your script to set a breakpoint.

```import pdb
pdb.set_trace()```

```import profile
`python -m SimpleHTTPServer`