用split(" ")测试：
s1 = "we are family"#中间一个空格
s2 = "we are family"#中间两个空格
s3 = "we are family"#中间三个空格
s4 = "we are family"#中间四个空格 s1 = s1.split(" ")
s2 = s2.split(" ")
s3 = s3.split(" ")
s4 = s4.split(" ") print(s1)#['we', 'are', 'family']
print(s2)#['we', '', 'are', '', 'family']
print(s3)#['we', '', '', 'are', '', '', 'family']
print(s4)#['we', '', '', '', 'are', '', '', '', 'family']
用split()测试：
s1 = "we are family"#中间一个空格
s2 = "we are family"#中间两个空格
s3 = "we are family"#中间三个空格
s4 = "we are family"#中间四个空格 s1 = s1.split()
s2 = s2.split()
s3 = s3.split()
s4 = s4.split() print(s1)#['we', 'are', 'family']
print(s2)#['we', 'are', 'family']
print(s3)#['we', 'are', 'family']
print(s4)#['we', 'are', 'family']
结论：split()的时候，多个空格当成一个空格；split(' ')的时候，多个空格都要分割，每个空格分割出来空。