字符串，列表，元组，字典的方法集合

# ######整理########
# 一、数字
# int()
#
# 二、字符串
#
# replace / find / join / strip / startwith / split / upper / lower / format /
#replace：

b = "djlaaaakajflk"
print(b.replace('a','c',))

find：

b = "djlaaaakajflk"
c = b.find('jj')
print (c)

join：

b = "-"
seq = ['a','kk','dfd']
print ( b.join(seq))

startswith：

b = ' fjkdsjfk 0000 fjksj kkk 000 '
print (b)
print (b.startswith(''))

strip：

b = '-'
c = 'hello world'
print (c.strip(''))

split：

b = ' fjkdsjfk 0000 fjksj kkk 000 '
print (b.split())
print (b.split(' '))
print (b.split(' '))

format：

v = "i am {name},age is {age}"
v = v.format(name = 'blue',age = 18)
print(v)

# 三、列表
#
# append / extend / insert /
# 索引、切片、循环

extend：

li = ['xy','dff']
li2 = ['dddd','dd'] 
li.extend(li2)
print (li)

insert：

li = ['xy','dff']
li.insert(1,'ppp')
print(li)

切片：

li = ['xxx','yyy','zzz','888',9,'dfkd']
print(li[:])

a = [1,2,3,4,5,6,7]
print (a[::-2])

"""其中a[len(a)-1]等同于a[-1]，a[-len(a)]等同于a[0]，
分别表示序列的最后一个和第一个对象。"""

# 四、元组
#
# 索引、切片、循环
# 不能修改，增加
#
# 五、字典
# get / update / keys / values / items
#
# for ，索引

# 六、布尔值
# 0 1
# bool()
#
# 假： none "" [] () 0 ===> False