#coding:utf-8

#利用dict特性去掉一個list中重複的資料
def del_repeate_data():
    mylist = [1,1,2,3,4,5,4,2,5,5,5]
    d = {}
    for x in mylist:
        d[x] = 1
        mylist = list(d.keys())
    print mylist
# del_repeate_data()

#生成字典
def makedir(**kwargs):
    return kwargs

# dic = makedir(red=1,green=2,blue=3)
# print dic

#字串的倒序排列
mystr = "abcdefghijk"
print mystr[::-1]

#陣列的倒序排列
myarr = [1,2,3,4,45,5,6]
newarr = []
for i in reversed(myarr):
    newarr.append(i)
# print newarr

#遞迴
'''1+2+3+...+n'''
def rec(n):
    if n>0:
        return n+rec(n-1)
    else:# n<=0:
        return 0
print rec(100)

#如果在使用遞迴的時候，出現條件判斷，一定要把所有可能出現的條件都進行相應的處理
#求階乘
def fac(n):
    if n>0:
        return n*fac(n-1)
    elif n==0 or n==1:
        return 1
    else:
        pass
print fac(-4)