元祖变成字符串

Posted 2020-08-27 寂寞的小丑

 

 元祖变成字符串采用这种方式：

 

 字符串中替换部分字符串

from string import Template

s = Template(\'hello,${name} how are you,this is ${point},welcome to you\')
d = s.substitute(name = \'tom\',point = \'beijing\')
print d
输出：hello,tom how are you,this is beijing,welcome to you

#enumberate可以找到字符串，列表，元祖的的索引和值
f = \'helloworld\'
for i,t in enumerate(f):
    if(i == 3):
        print t
输出：索引3对应的值是： l

a = [\'aa\',\'bb\',\'cc\',\'dd\']
for i,t in enumerate(a):
    if(t == \'bb\'):
        print \'bb的索引是：\',i
输出：bb的索引是： 1

c = (\'ee\',\'ff\',\'gg\',\'hh\')
for i,t in enumerate(c):
    if(\'gg\'==t):
        print \'gg的索引是：\',i

输出：gg的索引是： 2

zip(arg0,arg1)

s ,t = \'hellotom\',\'world\'
print zip(s,t)
输出：[(\'h\', \'w\'), (\'e\', \'o\'), (\'l\', \'r\'), (\'l\', \'l\'), (\'o\', \'d\')]

sss = [\'aaa\',\'bbb\',\'ccc\',\'ddd\']
ppp = [\'ggg\',\'hhh\',\'iii\',\'kkk\',\'jjj\']
print zip(sss,ppp)
输出：[(\'aaa\', \'ggg\'), (\'bbb\', \'hhh\'), (\'ccc\', \'iii\'), (\'ddd\', \'kkk\')]

ss = (\'tt\',\'yy\',\'uu\',\'ii\')
pp = (\'11\',\'22\',\'33\',\'44\',\'55\',\'66\')
print zip(pp,ss)
输出：[(\'11\', \'tt\'), (\'22\', \'yy\'), (\'33\', \'uu\'), (\'44\', \'ii\')]

它只匹配对应的，成对输出，剩下的不输出

返回的都是固定格式的，返回元祖组成的列表，这是确定的格式。

数组，字符串，元祖他们相互之间是可以用zip()的:

s4 = (\'acv\',\'bdv\',\'eger\')
p4 = [\'ag\',\'sfd\',\'asf\',\'sf\']
print zip(s4,p4)
输出：[(\'acv\', \'ag\'), (\'bdv\', \'sfd\'), (\'eger\', \'asf\')]

s5 = \'helloworld\'
p5 = [\'aa\',\'bb\',\'ee\',\'ff\']
print zip(s5,p5)
输出：[(\'h\', \'aa\'), (\'e\', \'bb\'), (\'l\', \'ee\'), (\'l\', \'ff\')]

s6 = \'perfectOne\'
p6 = (\'eee\',\'yyy\',\'uuu\',\'www\',\'lll\')
print zip(s6,p6)
输出：[(\'p\', \'eee\'), (\'e\', \'yyy\'), (\'r\', \'uuu\'), (\'f\', \'www\'), (\'e\', \'lll\')]

判断变量的类型：isinstance(\'abc\',str)

print isinstance(\'abc\',str)
输出：True
print type(\'abc\')
输出：<type \'str\'> python中的string是str