Python "Learning Path 03" collection series with multi-level menu Demo

#!/usr/bin/env python
#-*-Coding:utf-8-*-
# @Time: 2017/11/18 9:50
# @Author: mixiu26

# Collection: Set----> Unique, unordered
List1 = [1,4,5,6,7,2,4,6]
# list to go:---->> directly convert the list to a collection: Set (List1)
List1 = set (List1)
# Print List1 and type:
Print (List1,type (list1)) # {1, 2, 4, 5, 6, 7} <class ' Set ' > set unordered, Element not duplicated

# Set intersection: Intersection ()----->> intersection
List2 = set ([2,3,4,5,6])
print (LIST1,LIST2) # {1, 2, 4, 5, 6, 7} {2, 3, 4, 5, 6}
Print (List1.intersection (list2)) # {2, 4, 5, 6}

# Set Merge set: Merge de-weight: Union ()
Print (List1.union (list2)) # {1, 2, 3, 4, 5, 6, 7}

# Difference set: Difference ()
Print (List1.difference (list2)) # {1, 7} takes out all 1 of the elements that are not in 2, takes out all the callers, and the elements that are not in the comparator
Print (List2.difference (list1)) # {3} Take out all 2 of the elements that are not in the

# Subset: Issubset----->> is part of you
Print (List2.issubset (list1)) # False List2 is a subset of List1?
list3 = set ([2,4,5,6,7])
Print (List3.issubset (list1)) # True List3 is a subset of List1:

# Parent set: Issuperset:
Print (List1.issuperset (LIST3)) # True List1 is a parent set of 3
Print (List1.issuperset (list2)) # False List1 is not a parent set of 2

# Reverse Difference set: Take out each other without each other's elements: is only the other side of the elements, all taken out
Print (List1.symmetric_difference (list2)) # {1, 3, 7}//Remove part of a two-person intersection---->> complement

list4 = set ([11,22,33,44,55])
# Determine if there is an intersection in the two collection:
Print (List1.isdisjoint (List2)) # False The intersection between the two returns false
Print (List1.isdisjoint (LIST4)) # True Returns True if there is no intersection between the two

# Set notation: & 1 ^-Orthogonal replenishment
print (LIST1,LIST2)
print (List1 & List2) # {2, 4, 5, 6}
Print (List1 | list2) # {1, 2, 3, 4, 5, 6, 7}
Print (list1 ^ list2) # {1, 3, 7}
print (LIST1-LIST2) # {1, 7}

# Collection---->> additions and changes:
List1.add (111)
print (List1) # {1, 2, 4, 5, 6, 7, 111}

# Add elements in bulk:
# list1.update (11,22,33) needs to be added in the format of the collection and cannot be added in bulk by adding a single element:
list1.update ([11,22,33])
print (List1) # {1, 2, 4, 5, 6, 7, one, 111,}--->> withdrawal disorder.

# Delete element:
List1.remove (one)
print (List1) # {1, 2, 4, 5, 6, 7, 111, $}

# Print Set length, number of elements:
print (len (list1)) # 9

# Determines whether an element is used in a collection, list, dictionary: x in a---->a can be a list, a collection string
print (one in list1) # False
print (111 in list1) # True

# POP ()--->> randomly deletes an element and returns:
# Print (List1.pop ()) # 1

# Discard---->> Delete the specified element:
Print (List1.discard (1), List1) # None {2, 33, 4, 5, 6, 7, 111, 22} must carry element Delete, delete element only, remove deleted element after delete, remove delete no element will error, Discar D not
Print (List1.discard (9876), List1) # None {2, 33, 4, 5, 6, 7, 111, 22}

#!/usr/bin/env python
#-*-Coding:utf-8-*-
# @Time: 2017/11/18 10:55
# @Author: mixiu26

data = {
' Beijing ': {
' changping ': {
' Shahe ': [' old boy ', ' Test '],
' Tian Tong Yuan ': ["Chain Home Property", "I love my Home"]
        },
' Chaoyang ': {
"Wangjing": ["Mercedes", "Mo Mo"],
" Guomao": {"CICC", "HP"},
"Dongzhimen": {"Advent", "Fetion"},
        },
' Hai ding ': {},
    },
' Shanghai ': {
' Minhang ': {
"People's Square": {
' Fried Chicken Shop ': {}
            }
        },
' Zhabei ': {
' Train war ': {
' Ctrip ': {}
            }
        },
' Pudong ': {},
    },
' Shandong ': {
"Texas": {},
"Qingdao": {},
"Jinan": {}
    }
}

Exit_flag = False

While not Exit_flag:
For i in data:
print (i)
choice = input ("Please select a menu city:")
# Determine if the selected city is in the two-level menu list range:
if choice in data:
While not exit_flag: # If you enter the city no longer my list range, I can cycle through the city list
For I2 in Data[choice]:
print ("\ t" + I2)
# Continue waiting for user input:
Choice2 = input ("Please select the city Level two area list menu >>>:")
if Choice2 in Data[choice]:
While not Exit_flag:
For i3 in Data[choice][choice2]:
print ("\t\t" + i3)
choice3 = input ("Please select Level Three street >>>:")
if Choice3 in Data[choice][choice2]:
For I4 in Data[choice][choice2][choice3]:
print ("\t\t\t" + i4)
# When we finish printing the list, we don't want it to exit the program right away because I want it to make a choice .
# If I'm typing Q I'm quitting the program and I'm typing D, I'm going to go back to the parent menu
Choice4 = input ("The ultimate menu layer, whether to exit program >>>:")
if Choice4 = = "B":
Pass # Go directly to the parent menu
elif Choice4 = = "Q":
# Change the flag value, exit the program
Exit_flag = True
Else: # If you do not add this judgment, there will be a problem, because my choice walk is pass, to this layer, enter any character he will return to the upper menu, so in else add a check:
print ("The current directory is already the last level, you can choose whether to exit the program >>>: b/q")
While not Exit_flag:
Choice5 = input ("Please enter select >>>:")
if Choice5 = = "B":
 Break
elif Choice5 = = "Q":
# Change the flag value, exit the program
Exit_flag = True
if choice3 = = "B":
Break # Go directly to the parent menu
elif Choice3 = = "Q":
Exit_flag = True
if Choice2 = = "B":
Break # Go directly to the parent menu
elif Choice2 = = "Q":
# Change the flag value, exit the program
Exit_flag = True

Python "Learning Path 03" collection series with multi-level menu Demo