Find duplicated string in python list, sample source code:

 

refer to code:

.

def find_duplicates(input_list):

seen = set()

duplicates = set()

for item in input_list:

if item in seen:

duplicates.add(item)

else:

seen.add(item)

return list(duplicates)

input_list = ["apple", "orange", "banana", "apple", "orange", "grape"]

duplicates = find_duplicates(input_list)

print(duplicates)

>>>>>>>>>>>>>>>>>>

['apple', 'orange']

..

Thank you.

🙇🏻‍♂️

How to Save and Load Python Lists using Pickle

 refer to code:

.

import pickle

# Example list

my_list = [(40, 1.646054384000001), (233, 3.0769193350000013), (221, 2.6460548819999996),

(214, 2.3542021680000005), (322, 2.726835301999998), (94, 1.201160183999999),

(193, 2.501363478000002), (171, 1.3009034040000031), (595, 5.574669749999998)]

# Save list to a file using pickle

with open("my_list.pickle", "wb") as f:

pickle.dump(my_list, f)

# Load list from the saved file

with open("my_list.pickle", "rb") as f:

loaded_list = pickle.load(f)

# Verify that the loaded list matches the original list

print(loaded_list == my_list) # True

..

thank you.

🙇🏻‍♂️

www.marearts.com

How to Get the Shape of a List of Lists in Python

refer to code:

...

def get_shape(l):

if isinstance(l, list):

return [len(l)] + get_shape(l[0])

else:

return []

l = [[1, 2, 3], [4, 5], [6, 7, 8, 9]]

print(get_shape(l)) # Output: [3, 3]

l = [[1, [2, 3]], [4, [5, [6, [7]]]]]

print(get_shape(l)) # Output: [2, 2, 2, 1]

...

Thank you.

🙇🏻‍♂️

www.marearts.com

python list reverse

refer to code: 

..

Test_list = [1, 2, 3, 4, 5]
Test_list.reverse()
print(Test_list)  # Output:  [5,4,3,2,1]

..

Thank you.

Python Convert List into a space-separated string

 

refer to code

..

lst = ['I', 'am', 'a', 'humen']

strlist = ' '.join(lst)

print(strlist, type(strlist))

..

I am a humen <class 'str'>

Thank you.

remove duplicated tuple item in list (python code)

 

print(tuple_list)

tuple_list = [ tuple(sorted(tuple_list[i])) for i in range(len(tuple_list))]

tuple_list = list(set(tuple_list))

print(tuple_list)

before:

[(0, 0), (0, 1), (0, 3), (1, 0), (1, 1), (1, 2), (2, 1), (2, 2), (2, 3), (3, 0), (3, 2), (3, 3)]

After:
[(0, 1), (1, 2), (0, 0), (3, 3), (2, 3), (2, 2), (0, 3), (1, 1)]

python list, numpy slicing

Oh.. I seem to be old.. I need a memo everything..
This is memo for me about list slicing.

nums = list(range(5))
print(nums)      #[0, 1, 2, 3, 4]
print(nums[2:4]) #[2, 3]
print(nums[2:])  #[2, 3, 4] 
print(nums[:2])  #[0, 1]
print(nums[:])   #[0, 1, 2, 3, 4]
print(nums[:-1]) #[0, 1, 2, 3]
nums[2:4] = [8,9]
print(nums)      #[0, 1, 8, 9, 4]

result
[0, 1, 2, 3, 4]
[2, 3]
[2, 3, 4]
[0, 1]
[0, 1, 2, 3, 4]
[0, 1, 2, 3]
[0, 1, 8, 9, 4]


numpy slicing

import numpy as np

a = np.array([1, 2, 3, 4, 5])
print(a[1:3]) #array [2 3]
print(a[-1]) #5
a[0:2] = 9
print(a) #array [9 9 3 4 5]
b = np.array([[1, 2, 3, 4], [5, 6, 7, 8], [9, 10, 11, 12]])
print(b)
#array
#[[ 1  2  3  4]
# [ 5  6  7  8]
# [ 9 10 11 12]]

print(b[:,1]) #array [2 6 10]
print(b[-1])      #array [9 10 11 12]
print(b[-1,:])    #array [9 10 11 12]
print(b[-1, ...]) #array [9 10 11 12]

print(b[0:2, :])
#array#[[1 2 3 4]# [5 6 7 8]]

😀

python element in list and element no in list, simple example

element in list

if 2 in [1, 2, 3]:
    print('2 in list')
else:
    print('2 in not list')


if 4 in [1, 2, 3]:
    print('4 in list')
else:
    print('4 in not list')


if (1,2) in [(1, 2) , (3, 2)]:
    print('(1,2) in list')
else:
    print('(1,2) in not list')

result



element no in list

if 4 not in [1, 2, 3]:
    print('4 not in list')
else:
    print('4 in list')


if (1,2) not in [(1, 2), (3, 2)]:
    print('(1,2) in not linst')
else:
    print('(1,2) in list')

result

Removing duplicates in lists using set, python

Simple example using set


>>> t = [1, 2, 3, 5, 6, 7, 8]
>>> t = t + [1]

>>> t = t + [2]

>>> t = [1, 2, 3, 1, 2, 5, 6, 7, 8]
>>> t
[1, 2, 3, 1, 2, 5, 6, 7, 8]
>>> list(set(t))
[1, 2, 3, 5, 6, 7, 8]
>>> s = [1, 2, 3]
>>> list(set(t) - set(s))
[8, 5, 6, 7]

reference : https://stackoverflow.com/questions/7961363/removing-duplicates-in-lists