close

Comprehensions katika Python: List ,, Dictionary _ Set

List Comprehensions

  • List comprehensions ni njia fupi na bora ya kuunda list s in Python.
  • Zinakuruhusu kuunda mpya list kwa kutumia usemi kwa kila kipengee katika hali inayoweza kutekelezeka(km, list, tuple, string) na kuchuja vipengee kulingana na hali.
  • Sintaksia ya list ufahamu ni: [expression for item in iterable if condition]

Mfano:

# List comprehension to generate a list of squares of numbers from 0 to 9  
squares = [x**2 for x in range(10)]  
print(squares)   # Output: [0, 1, 4, 9, 16, 25, 36, 49, 64, 81]  
  
# List comprehension to filter even numbers from a list  
numbers = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]  
even_numbers = [x for x in numbers if x % 2 == 0]  
print(even_numbers)   # Output: [2, 4, 6, 8, 10]

 

Dictionary Comprehensions

  • Dictionary comprehensions hukuruhusu kuunda kamusi kwa njia mafupi.
  • Sawa na list comprehensions, wao hutoa mpya dictionary kwa kutumia usemi kwa kila kipengee katika vipengee vinavyoweza kutekelezeka na kuchuja kulingana na hali.
  • Sintaksia ya dictionary ufahamu ni: {key_expression: value_expression for item in iterable if condition}

Mfano:

# Dictionary comprehension to create a dictionary of squares of numbers from 0 to 9  
squares_dict = {x: x**2 for x in range(10)}  
print(squares_dict)   # Output: {0: 0, 1: 1, 2: 4, 3: 9, 4: 16, 5: 25, 6: 36, 7: 49, 8: 64, 9: 81}  
  
# Dictionary comprehension to filter even numbers from a dictionary  
numbers_dict = {1: 'one', 2: 'two', 3: 'three', 4: 'four', 5: 'five'}  
even_numbers_dict = {key: value for key, value in numbers_dict.items() if key % 2 == 0}  
print(even_numbers_dict)   # Output: {2: 'two', 4: 'four'}

 

Set Comprehensions

  • Set comprehensions hukuruhusu kuunda set s kwa njia sawa na list comprehensions na dictionary comprehensions.
  • Hutoa jipya set kwa kutumia usemi kwa kila kipengee katika vipengee vinavyoweza kutekelezeka na kuchuja kulingana na hali.
  • Sintaksia ya set ufahamu ni: {expression for item in iterable if condition}

Mfano:

# Set comprehension to create a set of squares of numbers from 0 to 9  
squares_set = {x**2 for x in range(10)}  
print(squares_set)   # Output: {0, 1, 4, 9, 16, 25, 36, 49, 64, 81}  
  
# Set comprehension to filter even numbers from a set
numbers_set = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10}  
even_numbers_set = {x for x in numbers_set if x % 2 == 0}  
print(even_numbers_set)   # Output: {2, 4, 6, 8, 10}

 

Comprehensions katika Python kutoa njia fupi na inayoweza kusomeka ya kuunda list s, kamusi, na set s kulingana na maandishi yaliyopo, na kufanya msimbo wako kuwa wa kifahari na bora zaidi.