GuoXin Li's Blog

Character string and Data type

字数统计: 340阅读时长: 2 min
2018/08/11 Share

Character String e.g.:

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>>> str1 = 'abcdefg'
>>> str1[2]
'c'
>>> str1[1]
'b'
>>> str1[-0]		#the first one
'a'
>>> str1[-1]		#the last one
'g'
>>> str1[1:4]		#from the second to the fifth, but not contain the fifth
'bcd'
>>> str1[2:4]		#from the third to the fifth, but also not contain the fifth
'cd'
>>> str1[0:-2]
'abcde'
>>> str1[:-2]		#same to str1[0:-2]
'abcde'

Data type of Python

  • create and operate list

demo:

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>>> list1 = []			#define a list
>>> list1.append(1)		#add an element to list
>>> list1.count(2)		#calculate the occurrence number of 2 in the list
0
>>> list1.extend([2,3,5,4])	#add another list to list
>>> list1
[1,2,3,5,4]
>>> list1.index(5)		#get the location of the element in list
3
>>> list1.insert(2,6)#insert 6 to the third location in list
>>> list1
[1,2,6,3,5,4]
>>> list1.pop(2)		#delete the third element in list
6
>>> list1
[1,2,3,5,4]
>>> list1.remove(5)		#remove 5 from the list
>>> list1
[1,2,3,4]
>>> list1.reverse()		#reverse the element in list
>>> list1
[4,3,2,1]
>>> list1.sort()		#rearrange the element in list
>>> list1
[1,2,3,4]
  • create and operate the tuple

Once defined, can’t be changed.

demo:

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>>> tuple1 = ('a','b','c')	#define a tuple
>>> list1.insert(4,tuple1)	#insert tuple1 to list
>>> list1
[1,2,3,4,('a','b','c')]
>>> tuple1[2]			#get the third element in tuple
'c'
>>> tuple1[1:-1]
('b',)
CATALOG
  1. 1. Character String e.g.:
  2. 2. Data type of Python
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