python基础数据类型的相关知识点

>>> s = "Hello"
>>> s1 = s.join("你好")#将字符串Hello插入到你好中
>>> s1
‘你Hello好‘
>>> s2 = "Tanxu".join("你好吗")#将字符串Tanxu插入到你好吗中
>>> s2
‘你Tanxu好Tanxu吗‘

>>> s3 = "_".join(["Tanxu","is","a","good","student"])
>>> s3
‘Tanxu_is_a_good_student‘

>>> lst = ["Tanxu","is","a","good","student"]
>>> for el in lst:
	lst.remove(el)

	
>>> lst
[‘is‘, ‘good‘]

lst = ["Tanxu","is","a","good","student"]

#准备一个空列表
del_lst = []
for el in lst:
       del_lst.append(el) #记录下来要删除的内容
for el in del_lst: #循环记录的内容
        lst.remove(el)#删除原来的内容
print(lst)

#删除以周开头的人
lst1 = ["周杰伦","周星驰","周润发","马化腾","马云"]

del_lst1 = []
for el in lst1:
        del_lst1.append(el)

for el in del_lst1:
        if "周" in el:
                lst1.remove(el)
print(lst1)

>>> dic = {‘a‘:‘123‘}
>>> s = dic.fromkeys("Hello","你好") #返回一个新的字典
>>> s
{‘H‘: ‘你好‘, ‘e‘: ‘你好‘, ‘l‘: ‘你好‘, ‘o‘: ‘你好‘}