Python Learning D4

List

The list is called the container type data type.

# Li = [123, ' Old boy ', True, [1, 2, 3], {' name ': ' Alex '}, (1, 2, 3)]

Index

# L1 = [' Wusir ', True, ' Alex ', ' Laonanhai ', ' Ritian ', ' Taibai ']

# print (l1[0]) # print (l1[1], type (l1[1])) # To take a value by slice # print (L1[:3]) # print (l1[2:]) # print (L1[::2])

Additions and deletions and other methods

# Increase

#append Append

#Print (L1.append (' goddess '))#l1.append (123)#L1.append ([1, 2, 1111])#print (L1)#name_list = [' Wusir ', ' Alex ', ' Laonanhai ', ' Ritian ', ' Taibai ']#While True:#username = input (' Please enter a new employee name: Q or Q exit '). Strip ()#if username.upper () = = ' Q ': break#name_list.append (username)#print (' You have successfully added%s '% username)#print (name_list)

#insert Insert

# L1.insert (1, ' a ') # print (L1)

# Extend iteration with append

# l1.extend (' ABCD ') # L1.extend ([1, 2, 3, 4, ' abc ']) # print (L1)

# Delete

# pop is deleted by index, with return value

# ret = l1.pop (0) # print (ret) # print (L1)

# Remove is deleted by element

# l1.remove (' Alex ') # print (L1)

# Clear Empty List

# l1.clear () # print (L1)

#del

" " 1, delete the list at the memory level del l1print (L1) 2, by index. Del l1[2]print (L1) 3, slice delete + step. Del l1[:-1]print (L1)"

# del L1 # print (L1) # del L1[2] # print (L1) # del L1[:-1] # print (L1) # del L1[:3:2] # print (L1)

# change

# 1, follow the index to change.  #  l1[0] = ' Xiaofeng '#  print (L1)#  l1[-1] = ' male god '#  Print (L1)#  2, according to the slice to change, the slice of the area of the contents of all deleted, in the iteration to add content.  #  l1[:3] = ' Edwin van der Sar sent to Ghfkhgh; ' # L1[:3] = [1111, 2222, 3333, 4444] # print (L1)

# look it up in the index slices.

#for循环

# For i in L1: #      Print (i)

#其他操作方法:
Number of #len

# cou = len (L1) # print (cou)

Number of #count elements

# Print (L1.count (' Taibai '))

#index searching for an index by element

# Print (L1.index (' Alex ', 3)) # L2 = [1, 3, 5, 9, 7, 6, 2, 4]

#sort from small to large, ordered by order

# L2.sort () # print (L2)

#sort from big to small, in reverse order

# L2.sort (reverse=true) # print (L2)

#翻转 Reverse

# L2.reverse () # print (L2)

Nesting of lists

L1 = [' Wusir ', ' Alex ', [, ' Taibai ', ' 98 '], 21]

# 1, turn the Wusir into full capitalization.

# l1[0] = ' Wusir ' # print (L1) # print (L1[0].upper ()) # l1[0] = L1[0].upper () # print (L1)

# 2, turn ' Taibai ' into an uppercase letter, other lowercase letters, put back in place.

# print (l1[2]) # L2 = l1[2] # l2[1] = L2[1].strip (). Capitalize () # l1[2][1] = L1[2][1].strip (). Capitalize () # print (L1) # l1[2].append (' Shu qi ') # print (L1)

# 3, add 99 to the ' 100 ' of the string with the addition of numbers.

# l1[2][0] = str (l1[2][0] + 1) # print (L1)

# 4, the string ' 98 ' becomes the number 100.

# l1[2][2] = Int (l1[2][2]) + 2 # print (L1)

# tuples

Read-only list, can not be deleted and changed only query

# Tu = (11, 22, 33, 44, 55)

#索引, Slice, step

# print (tu[0]) # print (Tu[:3:2]) # For i in Tu: #      Print (i)

# index  Len  count

Range

As a list of custom numeric ranges,
# satisfies the Gu Tou disregard butt, can add the step size, with the for loop use together.

#for I in range (0, 101): #[0,1,2,3,.... []#print (i)#For I in range (one): # [0,1,2,3,.... Ten]#print (i)#For i in range (0, 101, 3):#print (i)#for I in range (0,-1):#print (i)#L1 = [ +, +, +, +, +, +,]#For i in L1:#Print (L1.index (i))#For i in range (len (L1)):#print (i)

Prints all the elements in the L1 list, including the internal list.

L1 = ['Wusir','Alex', [99,'Taibai','98'], 21] forIinchL1:ifType (i) = =list: forJinchI:Print(j)Else:Print(i)

Python Learning D4