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Anonymous

Asked: October 23, 2022Computer programming

How do I count the occurrences of all list items using python?

I have a list which contain names of students. Example: Read more

Best Answer
Anonymous
Added an answer on October 23, 2022 at 7:17 am
You can use Counter if you want to do multiple count of the list from collections import Counter list = ['Jones','Adams','Frank','John','Lopez','Jones','Smith','Ivan','Julian','Carlos','Adams','Frank','Jones','John','Ivan'] print(Counter(list)) Result: Counter({'Jones': 3, 'Adams': 2, 'Frank': 2, 'JRead more
You can use Counter if you want to do multiple count of the list
Python
from collections import Counter list = ['Jones','Adams','Frank','John','Lopez','Jones','Smith','Ivan','Julian','Carlos','Adams','Frank','Jones','John','Ivan'] print(Counter(list))
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from collections import Counter
list = ['Jones','Adams','Frank','John','Lopez','Jones','Smith','Ivan','Julian','Carlos','Adams','Frank','Jones','John','Ivan']
print(Counter(list))

Result:
Python
Counter({'Jones': 3, 'Adams': 2, 'Frank': 2, 'John': 2, 'Ivan': 2, 'Lopez': 1, 'Smith': 1, 'Julian': 1, 'Carlos': 1})
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Counter({'Jones': 3, 'Adams': 2, 'Frank': 2, 'John': 2, 'Ivan': 2, 'Lopez': 1, 'Smith': 1, 'Julian': 1, 'Carlos': 1})

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Anonymous

Asked: August 9, 2022Computer programming

How to flatten a list of lists in python?

Hi, I want to convert a list using python. I have a list of list like this: Read more

Anonymous

Added an answer on August 9, 2022 at 9:02 am

Hello this code may help you: def flatten_list(original_List): flat_list = [] for sub_list in original_List: for element in sub_list: flat_list.append(element) return flat_list #test original_List=[['a', 'b', 'c', 'd','e'], ['f', 'g', 'h', 'i'], ['j', 'k', 'l'], ['m', 'n', 'o']] print('original listRead more

Hello

this code may help you:

def flatten_list(original_List):
    flat_list = []
    for sub_list in original_List:
        for element in sub_list:
            flat_list.append(element)
    return flat_list

#test
original_List=[['a', 'b', 'c', 'd','e'], ['f', 'g', 'h', 'i'], ['j', 'k', 'l'], ['m', 'n', 'o']]
print('original list = ', original_List)
print('flat list = ', flatten_list(original_List))

def flatten_list(original_List):

flat_list = []

for sub_list in original_List:

for element in sub_list:

flat_list.append(element)

return flat_list

#test

original_List=[['a', 'b', 'c', 'd','e'], ['f', 'g', 'h', 'i'], ['j', 'k', 'l'], ['m', 'n', 'o']]

print('original list = ', original_List)

print('flat list = ', flatten_list(original_List))

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Marie

Asked: August 9, 2022Computer programming

How do I use a global variable inside a function using Python?

Hi I have a variables that is declared outsides fucntions. How can I use and change these variables inside function usign Python? thank you

Best Answer

Gwennavia

Added an answer on August 9, 2022 at 9:40 am

Follow this example to create a variable outside functions, and use it inside the functions: MyVariable = 99 #this is a global variable def changeAndPrint_GlobalVariable(): global MyVariable #use global variable in this function with "global" keyword print('Global variable "MyVariable" before changeRead more

Follow this example to create a variable outside functions, and use it inside the functions:

MyVariable = 99 #this is a global variable

def changeAndPrint_GlobalVariable():
    global MyVariable  #use global variable in this function with "global" keyword
    print('Global variable "MyVariable" before change = ', MyVariable) # the global variable is printed
    MyVariable = 1  #change the value of the global variable is printed
    print('Global variable "MyVariable" after change = ', MyVariable) # the global variable is printed

def changeAndPrint_LocalVariable():
    MyVariable = 77 #this is a local variable
    print('Local variable "MyVariable" = ', MyVariable) #the local variable is printed

changeAndPrint_GlobalVariable() #call the function
changeAndPrint_LocalVariable() #call the function

MyVariable = 99 #this is a global variable

def changeAndPrint_GlobalVariable():

global MyVariable #use global variable in this function with "global" keyword

print('Global variable "MyVariable" before change = ', MyVariable) # the global variable is printed

MyVariable = 1 #change the value of the global variable is printed

print('Global variable "MyVariable" after change = ', MyVariable) # the global variable is printed

def changeAndPrint_LocalVariable():

MyVariable = 77 #this is a local variable

print('Local variable "MyVariable" = ', MyVariable) #the local variable is printed

changeAndPrint_GlobalVariable() #call the function

changeAndPrint_LocalVariable() #call the function

This code will print:

Global variable "MyVariable" before change =  99
Global variable "MyVariable" after change =  1
Local variable "MyVariable" =  77

Global variable "MyVariable" before change = 99

Global variable "MyVariable" after change = 1

Local variable "MyVariable" = 77

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Anonymous

Asked: August 15, 2022Computer programming

How to remove duplicate values from list in Python?

Hi I have two lists list1 and list2 I want to extract all values that exist in list1 and don’t exist in list2. I tried this code: Read more

Best Answer

Anonymous

Added an answer on August 15, 2022 at 7:56 pm

You can simly use a for loop with append to list. list1 = ['lion', 'dog', 'cat', 'tiger', 'cat', 'cat', 'zebra'] list2 = ['monkey', 'tiger', 'cow', 'mouse'] my_list = [] for animal in list1: #iterating over list1 if animal not in list2 and animal not in my_list: my_list.append(animal) #add item to tRead more

You can simly use a for loop with append to list.

list1 = ['lion', 'dog', 'cat', 'tiger', 'cat', 'cat', 'zebra']
list2 = ['monkey', 'tiger', 'cow', 'mouse']

my_list = []
for animal in list1: #iterating over list1
    if animal not in list2 and animal not in my_list:
        my_list.append(animal) #add item to the list
        
print(my_list)

list1 = ['lion', 'dog', 'cat', 'tiger', 'cat', 'cat', 'zebra']

list2 = ['monkey', 'tiger', 'cow', 'mouse']

my_list = []

for animal in list1: #iterating over list1

if animal not in list2 and animal not in my_list:

my_list.append(animal) #add item to the list

print(my_list)

my_list = ['lion', 'dog', 'cat', 'zebra']

1 2	my_list = ['lion', 'dog', 'cat', 'zebra']

kind regards

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