计数,dic的创建方式，求九九乘法表

s1='char,python,nihao,ni,ni,python'
s=s1.split(',')
print(s1)
s2=list()
for i in s:
    if i not in s2:
        s2.append(i)
        s2.append(1)
    else:
        if i in s2:
            s2[s2.index(i)+1]= str(int(s2[s2.index(i)+1])+1)
print(s2)
i=0
while i<len(s2):
   print(s2[i],s2[i+1],sep='---')
   i+=2

 dic = {}
# 第一种：
# 创建空字典
# dic = {}
# type(dic)# <type 'dict'>

# 2:通过赋值创建。
# dic = {'spam':1,'egg':2, 'bar':3}

# 3：通过dict函数和关键字参数
# dict()
# dic = dict(spam = 1, egg = 2, bar =3)
# print(dic)
# {'spam':1,'egg':2,'bar':3}
# *args,**kwargs
# **kwargs
# def index_01(gender = '男')

# 默认参数。
# def print(self, *args, sep=' ', end='\n', file=None):
# 关键字参数。
# print(end='  ')

# 4. 通过列表转字典。
# l = [('spam', 1), ('egg', 2), ('bar', 3)]
# dic = dict(l)
# print(dic)
# {'spam': 1, 'egg': 2, 'bar': 3}

# 5:通过dict函数和zip函数获取
# dic = dict(zip('abc', [1, 2, 3]))
# zip

# dic = dict(zip('abc', [1, 2, 3]))
# print(dic)

# 6:通过字典推导式创建。
# dic = {i:2*i for i in range(3)}

# dic = { str(i) : i * 2 for i in range(9) }
# 可以删选，加if
# '0':0,'1':2....

# print(dic)
# k:v
# [ i*2 for i in range(9)]

# { str(i) :i*2 for i in range(9) }

# 7：通过dict.fromkeys()创建
# 通常用来初始化字典, 设置value的默认值

# dic = dict.fromkeys('nihao',3)
# # {'n': 3, 'i': 3, 'h': 3, 'a': 3, 'o': 3}
# print(dic)

# {'k':3,'i':3,'h':3,'a':3}

# dict.
# class dict
# # 装饰器。语法糖
#     @classmethod, @overload
#     def fromkeys(cls, __iterable: Iterable[_T])
#     -> Dict[_T, Any]
# Possible types: • (cls: Type[dict], __iterable: Iterable[_T]) 
# : _S) -> Dict[_T, _S]
#
# Create a new dictionary
# with keys from iterable
# and values set to value.
# key : value
# nihao

# 8:其他方式
l = ['x', 1, 'y', 2, 'z', 3]
# l[::2]
# l[1::2]
# dict(zip(['x','y','z'],[1,2,3]))
dic = dict(zip(l[::2], l[1::2]))
print(dic)

for i in range(1,10):
#     for j in range(1,i+1):
#         print(f'{j} * {i} = {j*i}\t',end=' ')
#     print()

巴特西

计数,dic的创建方式，求九九乘法表

最新文章

热门文章