Dada una string, escriba un programa en Python para encontrar si una string contiene solo números o no. Veamos algunos métodos para resolver la tarea anterior.
Método #1: Usar el método isdigit()
Python3
# Python3 code to demonstrate
# how to check whether string contains
# only numbers or not
# Initialising string
ini_string1 = '1234556'
ini_string2 = 'ab123bc'
# printing initial string
print ("Initial Strings : ", ini_string1, ini_string2)
# Using isdigit()
if ini_string1.isdigit():
print ("String1 contains all numbers")
else:
print ("String1 doesn't contains all numbers")
if ini_string2.isdigit():
print ("String2 contains all numbers")
else:
print ("String2 doesn't contains all numbers")
Producción:
Initial Strings : 1234556 ab123bc String1 contains all numbers String2 doesn't contains all numbers
Método #2: Usar expresiones regulares
Python3
# Python3 code to demonstrate
# how to check whether string contains
# only numbers or not
import re
# Initialising string
ini_string1 = '1234556'
ini_string2 = 'ab123bc'
# printing initial string
print ("Initial Strings : ", ini_string1, ini_string2)
# Using regex()
if re.match('^[0-9]*$', ini_string1):
print ("String1 contains all numbers")
else:
print ("String1 doesn't contains all numbers")
if re.match('^[0-9]*$', ini_string2):
print ("String2 contains all numbers")
else:
print ("String2 doesn't contains all numbers")
Producción:
Initial Strings : 1234556 ab123bc String1 contains all numbers String2 doesn't contains all numbers
Método #3: Usar prueba/excepción
Python3
# Python3 code to demonstrate
# how to check whether string contains
# only numbers or not
# Initialising string
ini_string1 = '1234556'
ini_string2 = 'abc123'
# printing initial string
print ("Initial Strings : ", ini_string1, ini_string2)
# Using try / exception:
try:
num = int(ini_string1)
print ("String1 contains only digits")
except:
print ("String1 doesn'tcontains only digits")
try:
num = int(ini_string2)
print ("String2 contains only digits")
except:
print ("String2 doesn't contains only digits")
Producción:
Initial Strings : 1234556 abc123 String1 contains only digits String2 doesn't contains only digits
Publicación traducida automáticamente
Artículo escrito por garg_ak0109 y traducido por Barcelona Geeks. The original can be accessed here. Licence: CCBY-SA