Dada una Lista, la tarea es filtrar elementos de la lista en función de otra lista de strings. Este tipo de problemas son bastante comunes al raspar sitios web.
Ejemplos:
Input:
List_string1 = ['key', 'keys', 'keyword', 'keychain', 'keynote']
List_string2 = ['home/key/1.pdf',
'home/keys/2.pdf',
'home/keyword/3.pdf',
'home/keychain/4.pdf',
'home/Desktop/5.pdf',
'home/keynote/6.pdf']
Output:
['home/Desktop/5.pdf']
Explanation: We filter only those element from
list_string2 that do not have string in list_string1
A continuación se presentan algunas formas de lograr la tarea anterior.
Método #1: Usar la iteración
# Python code to filter element from list
# based on another list of string.
# List Initialization
Input = ['key', 'keys', 'keyword', 'keychain', 'keynote']
Input_string = ['home/key/1.pdf',
'home/keys/2.pdf',
'home/keyword/3.pdf',
'home/keychain/4.pdf',
'home/Desktop/5.pdf',
'home/keynote/6.pdf']
Output = Input_string.copy()
temp = []
# Using iteration
for elem in Input_string:
for n in Input:
if n in elem:
temp.append(elem)
for elem in temp:
if elem in Output:
Output.remove(elem)
# Printing
print("List of keywords are:", Input)
print("Given list:", Input_string)
print("filtered list is :", Output)
La lista de palabras clave es: [‘key’, ‘keys’, ‘keyword’, ‘keychain’, ‘keynote’]
Lista dada: [‘home/key/1.pdf’, ‘home/keys/2.pdf’, ‘home/keyword/3.pdf’, ‘home/keychain/4.pdf’, ‘home/Desktop/5.pdf’, ‘home/keynote/6.pdf’] la
lista filtrada es: [‘home/Desktop/ 5.pdf’]
Método #2: Usar la comprensión de listas
# Python code to filter element from list
# based on another list of string.
# List Initialization
Input = ['key', 'keys', 'keyword', 'keychain', 'keynote']
Input_string = ['home/key/1.pdf',
'home/keys/2.pdf',
'home/keyword/3.pdf',
'home/keychain/4.pdf',
'home/Desktop/5.pdf',
'home/keynote/6.pdf']
# Using list comprehension
Output = [b for b in Input_string if
all(a not in b for a in Input)]
# Printing
print("List of keywords are:", Input)
print("Given list:", Input_string)
print("filtered list is :", Output)
La lista de palabras clave es: [‘key’, ‘keys’, ‘keyword’, ‘keychain’, ‘keynote’]
Lista dada: [‘home/key/1.pdf’, ‘home/keys/2.pdf’, ‘home/keyword/3.pdf’, ‘home/keychain/4.pdf’, ‘home/Desktop/5.pdf’, ‘home/keynote/6.pdf’] la
lista filtrada es: [‘home/Desktop/ 5.pdf’]
Publicación traducida automáticamente
Artículo escrito por everythingispossible y traducido por Barcelona Geeks. The original can be accessed here. Licence: CCBY-SA