공익(public good)의, 공익의 의한, 공익을 위한!

from matplotlib.pyplot import plot, show

nyc_temp_2000 = [31.3, 37.3, 47.2, 51.0, 63.5, 71.3, 72.3, 72.7, 66.0, 57.0, 45.3, 31.1]

nyc_temp_2006 = [40.9, 35.7, 43.1, 55.7, 63.1, 71.0, 77.9, 75.8, 66.6, 56.2, 51.9, 43.6]

nyc_temp_2012 = [37.3, 40.9, 50.9, 54.8, 65.1, 71.0, 78.8, 76.7, 68.8, 58.0, 43.9, 41.5]

months = range(1,13)

plot(months, nyc_temp_2000, months, nyc_temp_2006, months, nyc_temp_2012)    #plot(x1,y1,x2,y2,x3,y3)

show()

from matplotlib.pyplot import plot, show

from pylab import legend    #legend() 함수

nyc_temp_2000 = [31.3, 37.3, 47.2, 51.0, 63.5, 71.3, 72.3, 72.7, 66.0, 57.0, 45.3, 31.1]

nyc_temp_2006 = [40.9, 35.7, 43.1, 55.7, 63.1, 71.0, 77.9, 75.8, 66.6, 56.2, 51.9, 43.6]

nyc_temp_2012 = [37.3, 40.9, 50.9, 54.8, 65.1, 71.0, 78.8, 76.7, 68.8, 58.0, 43.9, 41.5]

months = range(1,13)

plot(months, nyc_temp_2000, months, nyc_temp_2006, months, nyc_temp_2012)

legend([2000, 2006, 2012])    #범례 만들어주는 함수

show()

>>>x_number = [1,2,3]

>>>y_number = [2,4,6]

>>>from plylab import plot, show    #plot()과 show() 함수는 pylab 모듈에서 import. matplotlib 패키지의 일종

>>>plot(x_numbers, y_numbers)

>>>show()

 #연결 그래프 (x,y) 좌표 마킹하기

>>>plot(x_number, y_numbers, marker = 'o')   

>>>show()

#좌표(x,y)만 마킹하기

>>>plot(x_number, y_numbers, 'o')   

>>>show()

def roots(a,b,c):

    D = (b*b - 4*a*c)**0.5        

    x_1 = (-b + D) / (2*a)

    x_2 = (-b - D) / (2*a)

    print('x1 : {0}'.format(x_1))

    print('x2 : {0}'.format(x_2))

if __name__ == '__main__':

    a = input('Enter a: ')

    b = input('Enter b: ')

    c = input('Enter c: ')

    roots(float(a), float(b), float(c))

'''Unit converter : Miles and Kilometers'''

def print_menu():

    print('1. Kilometers to Miles')

    print('2. Miles to Kilometers')

def km_miles():

    km = float(input('Enter distance in kilometers: '))

    miles = km / 1.609                                            #1마일 = 1.609km

    print('Distance in miles: {0}'.format(miles))

def miles_km():

    miles = float(input('Enter distance in miles: '))

    km = miles * 1.609

    print('Distance in kilometers: {0}'.format(km))

if __name__ == '__main__':

    print_menu()

    choice = input('Which conversion would you like to do?:  ')

    if choice == '1':

        km_miles()

    if choice =='2':

        miles_km()

''''Multiplication table printer'''                   #구구단으로도 응용가능

def multi_table(a):

    for i in range(1, 11):

        print('{0} * {1} = {2}'.format(a, i, a*i))    #format()은 파이썬3.5(우분투 16.04)에서는 오류 발생함

if __name__ == '__main__':                        #c언어의 main()와 같음

    a = input('Enter a number: ')

    multi_table(float(a))

def multi_table(a):

    for i in range(1,10):

        print('{0} * {1} = {2}'.format(a, i, a*i))

if __name__ == '__main__':

    a = input('Enter a number: ')

    multi_table(int(a))