Python- basic data type (list, tuple)

I. column list

    Introduction 1.1 List 

      Is a list of the python ⼀ of a base data type, other programming languages ​​have similar data types such as arrays of JS, java in the array, etc. It is surrounded by [], with each element ',' spaced on it and can store various types of data: 

= LST [ 1 , ' ha ' , ' Houhou " , [ 1 , 8 , 0 , " Baidu " ], ( " I " , " name " , " element " , " group " ), " ABC " , { " my name " : " dict dictionary " }, { " I called the collection " , "Set " }]

Compared to a list of strings not only can store different types of data on it and can store large amounts of data can be stored python 32:... 536 870 912 elements 64 can be stored: 1152921504606846975 elements on it and the list is ordered ( order you save), an index, you can cut still pictures ⽅ value.

II. List of additions and deletions to change search 

　　1. increase

　　　Note, list and str are not the same. Lst can change so directly motivated ⾏ operating in the original object

By #
LST = [ ' date ' , ' as ' , ' fragrance ' , ' LU ' , ' green ' , ' purple ' , ' smoke ' ]
lst.append ( ' Bai ' )
print(lst)

lst.insert ( 1 , ' lens ' ) in the lens insertion position # 1, the original position of the element moves rearwardly a
print(lst)

# Add iterative
lst.extend ([[ ' Liu ' , ' Xuan ' , ' de ' ]])
print(lst)

2. Delete pop, remove, clear, del

# Delete
LST = [ ' date ' , ' as ' , ' fragrance ' , ' LU ' , ' green ' , ' purple ' , ' smoke ' ]
EL = lst.pop ( 3 ) # default deletion removed the last element No. 3 is returned to remove elements
print (el)

lst.clear () # Clear List
print(lst)

lst.remove('紫')
print(lst)

# Cut pieces delete still pictures 
del lst[1:3]
print(lst)

3. Modify Index modify sections 

Modify Index #
LST = [ ' King Jan ' , ' king of February ' , ' King of March ' , ' King of April ' ]
LST [ 0 ] = ' daji '
print(lst)
LST [ . 3 ] = ' Zhen Ji '
print(lst)

# Slice modification
LST = [ ' King Jan ' , ' king of February ' , ' King of March ' , ' King of April ' ]
LST [ . 1 : . 3 ] = ' Luban ' , ' Sun Bin ' 
Print (LST)

4. query, a list is iterable, so it can be a for loop

for el in lst:
    print (el)

5. Other operations

Sort #
lst = [1,2,3,4,7,8,44,44,33,99,0,6]
lst.sort () # ascending order, from small to large order
lst.sort (Reverse = True) # reverse, descending order
reversed (lst) # reverse, a reverse order according to the original location
print(lst)

# Test string length
LST = [ ' King Jan ' , ' king of February ' , ' King of March ' , ' King of April ' ]
lst = len(lst)
print(lst)

# Queries king appeared in January
c = lst.count ( " King Jan " )
print(c)

IV. Nested tuple and the tuple 

  Tuple: a list of commonly known immutable separate warranty is called read-only list, the basic data type of tuples of python is ⼀, ⼩ Use parentheses, ⾥ surface may put any data type, the query may be recycled. slice can. but that can not be changed.

  Note: Do not change the tuple element means Submenu Submenu immutable elements within ⽽ Submenu element can be changed, depending on whether the sub-elements are mutable object. 

  Tuple if only ⼀ elements. Be sure to add a comma, otherwise it is not a tuple 

tu = ( 1 ,)
print(type(tu)) 

Five. Range 

   range can help us get to a set of data. These data can be obtained through the for loop. 

# Range count
 for i in the Range ( 10 ): # Only one argument, starting at 0, 10 ends
    print(i)
for I in Range ( 5 , 10 ): when two parameters #, starting at 5, 10 ends
    print(i)
for I in Range ( 9 - 10 - 2 ): # three parameters, beginning 9 - 10 ends, step 2, from the right to left
    print(i)