python中的字符串切割maxsplit

my_str.split(str1, maxsplit)

my_str = "hello world itcast and itcastcpp"
my_str1 = my_str.split(" ")
print(my_str1)

my_str2 = my_str.split(" ", 1)
print(my_str2)

my_str3 = my_str.split()  # 用的最多
print(my_str3)

my_str4 = my_str.split("itcast")
print(my_str4)


# 输出结果是
['hello', 'world', 'itcast', 'and', 'itcastcpp']
['hello', 'world itcast and itcastcpp']
['hello', 'world', 'itcast', 'and', 'itcastcpp']
['hello world ', ' and ', 'cpp']

s = 'a b c'
res = s.split()
res

['a', 'b', 'c']

s = 'a b c'
res = s.split(sep=' ', maxsplit=1)
res

['a', 'b c']

s = 'a.b.c'
res = s.split('.', 1)
res

['a', 'b.c']

s = 'a b c'
res = s.rsplit()
res

['a', 'b', 'c']

s = 'a b c'
res = s.rsplit(sep=' ', maxsplit=1)
res

['a b', 'c']

s = 'a.b.c'
res = s.rsplit('.', 1)
res

['a.b', 'c']