#!urs/bin/python3

 #coding:utf-8

 #定义变量a,b,c并赋值

 a,b,c=1,5.3,"sub2020"

 #输出变量赋值类型

 print (type(a),type(b),type(c))

 #输出字符串c的长度

 print ("len(c):" ,len(c))

 #输出c

 print (c)

 #输出c的 第一个[0] 到: 倒数第二个[-1] 之间的字符

 print ("(c[0:-1]):" ,(c[0:-1]))

 #输出第一个字符

 print ("(c[0]):" ,(c[0]))

 #输出c 索引[1]-[6]之间的字符

 print ("(c[1:6]):", (c[1:6])) 

 #Python中的字符串有两种索引方式，从左往右以0开始，从右往左以-1开始

 #输出 索引[-1]-[-4]之间的字符

 print ("(c[-1:-4]):", (c[-1:-4]))

 #输出 索引[-4]-[-1]之间的字符

 print ("(c[-4:-1]):", (c[-4:-1]))

 #输出索引[2]以后的字符

 print ("(c[2:]):", (c[2:]))

 #输出2次c

 print ("(c*2):", (c*2))

 #输出两个字符串链接后的结果

 print ('(c+"WWW"):', (c+"WWW"))

 print ("*"*60)

 list1=['sub',2020,'sub2020',20.20,'http']

 list2=['www',[1,2,3]]

 print ("list1 :" ,list1)

 print ("list2 :" ,list2)

 print ("len(list1) :" , len(list1))

 print ("len(list2) :", len(list2))

 print ("(list1[0:4]) :", (list1[0:4]))

 # print ("(list1[-1]) :" (list1[-1])) 输出错误，list无法用负值索引

 print ("list2*2 :", list2*2)

 print ("list1+list2 :", list1+list2)

 #List中的元素是可以改变的

 list1[4]="new"

 print ("new list1 :" ,list1)

 print ("*"*60)

 tuple1=('sub',2020,'sub2020',20.20,'http')

 tuple2=('www',[1,2,3])

 print ("tuple1 :" ,tuple1)

 print ("tuple2 :" ,tuple2)

 print ("len(tuple1) :" , len(tuple1))

 print ("len(tuple2) :", len(tuple2))

 print ("(tuple1[0:4]) :", (tuple1[0:4]))

 #元组有两种索引方式，从左往右以0开始，从右往左以-1开始

 print ("tuple1[-1] :" ,(tuple1[-1]))

 print ("tuple2*2 :", tuple2*2)

 print ("tuple1+tuple2 :", tuple1+tuple2)

 #tuple中的元素不可改变

 #tuple1[4]="new"

 #print ("new tuple1 :" ,tuple1)

<class 'int'> <class 'float'> <class 'str'>

len(c): 7

sub2020

(c[0:-1]): sub202

(c[0]): s

(c[1:6]): ub202

(c[-1:-4]):

(c[-4:-1]): 202

(c[2:]): b2020

(c*2): sub2020sub2020

(c+"WWW"): sub2020WWW

************************************************************

list1 : ['sub', 2020, 'sub2020', 20.2, 'http']

list2 : ['www', [1, 2, 3]]

len(list1) : 5

len(list2) : 2

(list1[0:4]) : ['sub', 2020, 'sub2020', 20.2]

list2*2 : ['www', [1, 2, 3], 'www', [1, 2, 3]]

list1+list2 : ['sub', 2020, 'sub2020', 20.2, 'http', 'www', [1, 2, 3]]

new list1 : ['sub', 2020, 'sub2020', 20.2, 'new']

************************************************************

tuple1 : ('sub', 2020, 'sub2020', 20.2, 'http')

tuple2 : ('www', [1, 2, 3])

len(tuple1) : 5

len(tuple2) : 2

(tuple1[0:4]) : ('sub', 2020, 'sub2020', 20.2)

tuple1[-1] : http

tuple2*2 : ('www', [1, 2, 3], 'www', [1, 2, 3])

tuple1+tuple2 : ('sub', 2020, 'sub2020', 20.2, 'http', 'www', [1, 2, 3])

(<type 'int'>, <type 'float'>, <type 'str'>)

('len(c):', 7)

sub2020

('(c[0:-1]):', 'sub202')

('(c[0]):', 's')

('(c[1:6]):', 'ub202')

('(c[-1:-4]):', '')

('(c[-4:-1]):', '')

('(c[2:]):', 'b2020')

('(c*2):', 'sub2020sub2020')

('(c+"WWW"):', 'sub2020WWW')

************************************************************

('list1 :', ['sub', 2020, 'sub2020', 20.2, 'http'])

('list2 :', ['www', [1, 2, 3]])

('len(list1) :', 5)

('len(list2) :', 2)

('(list1[0:4]) :', ['sub', 2020, 'sub2020', 20.2])

('list2*2 :', ['www', [1, 2, 3], 'www', [1, 2, 3]])

('list1+list2 :', ['sub', 2020, 'sub2020', 20.2, 'http', 'www', [1, 2, 3]])

('new list1 :', ['sub', 2020, 'sub2020', 20.2, 'new'])

************************************************************

('tuple1 :', ('sub', 2020, 'sub2020', 20.2, 'http'))

('tuple2 :', ('www', [1, 2, 3]))

('len(tuple1) :', 5)

('len(tuple2) :', 2)

('(tuple1[0:4]) :', ('sub', 2020, 'sub2020', 20.2))

('tuple1[-1] :', 'http')

('tuple2*2 :', ('www', [1, 2, 3], 'www', [1, 2, 3]))

('tuple1+tuple2 :', ('sub', 2020, 'sub2020', 20.2, 'http', 'www', [1, 2, 3]))

Traceback (most recent call last):

  File "basic_data_type.py", line 66, in <module>

    tuple2[1]=[1,2,3,4]

TypeError: 'tuple' object does not support item assignment

***Repl Closed***