学习python函数的一些笔记

#-*- coding:utf-8 -*-
sum= 0
x= 1
while x<100:
    x+= 2
    sum = x+ sum
print sum

for x in range(1,10):
    for y in range(x+1,10):
        print x*10+y

# -*- coding: utf-8 -*-
d = {
    95:'Adam',
    85:'Lisa',
    59:'Bart'
}

key = input('score:')
print d.get(key)

# 更新set
s = set(['Adam', 'Lisa', 'Paul'])
L = ['Adam', 'Lisa', 'Bart', 'Paul']
m = set(L)
p = s -m
q = m -s
s = p | q
print s

import math

def quadratic_equation(a, b, c):
    de=b**2-4*a*c
    if de>=0:
        x1=(-b+math.sqrt(de))/(2*a)
        x2=(-b-math.sqrt(de))/(2*a)
        return x1,x2
    else:
        return

print quadratic_equation(2, 3, 0)
print quadratic_equation(1, -6, 5)

# move(n, a, b, c)表示的是有n个盘子在a柱子上，将要移到b柱子上面去
def move(n, a, b, c):
# 如果a柱子上面只有一个盘子，则直接移到c柱子上面去并输出路径，结束递归
    if n == 1:
        print a, '-->', c
        return
# 表示的是将n-1的盘子从a柱子上面移到b柱子上面去
    move(n-1, a, c, b)
# 输出最下面个盘子移从a移到c的路径
    print a, '-->', c
# 将b柱子上面的n-1个盘子移动到c柱子上面
    move(n-1, b, a, c)

move(4, 'A', 'B', 'C')