import

1. math library

# Ask Python to print sqrt(25) on line 

import math

print math.sqrt(25) 

2. sqrt 만 import 해오기 / 전부 import 해오기

# Import *just* the sqrt function from math on line 3!

from math import sort

from math import *

3. library import 해올 때는 되도록 import module 한 다음 module.function 해서 쓸 것. 함수명/변수명 중복되서 막 사용될 수 있음.

import math            # Imports the math module

everything = dir(math) # Sets everything to a list of things from math

print everything       # Prints 'em all!

4. python 에 기본적으로 내장되어있는 함수들 .upper(), .lower(), str(), len(), max(), min(), abs()

def biggest_number(*args):    #여러개의 인자를 넘기는 방법이 특이하다. 오오.

    print max(args)

    return max(args)

    

def smallest_number(*args):

    print min(args)

    return min(args)

def distance_from_zero(arg):

    print abs(arg)

    return abs(arg)

biggest_number(-10, -5, 5, 10)

smallest_number(-10, -5, 5, 10)

distance_from_zero(-10)

5. max()

# Set maximum to the max value of any set of numbers on line 3!

maximum = max(1, 19231, 2.5)

print maximum

6. min()

# Set minimum to the min value of any set of numbers on line 3!

minimum = min(4, -2 , 10, 123, -123.1)

print minimum

7. abs()

absolute = abs(-42)

print absolute

8. type()

# Print out the types of an integer, a float,

# and a string on separate lines below.

print type(42)

print type(-1.2)

print type('keol')

9. 

def shut_down(s):

    if s == "yes":

        return "Shutting down"

    elif s == "no":

        return "Shutdown aborted"

    else:

        return "Sorry"

10.

import math

print math.sqrt(13689)

11.

def distance_from_zero(arg):

    if type(arg) == int or type(arg) == float:

        return abs(arg)

    else:

        return "Nope"