[Python] Richtige Verwendung der if-Anweisung

import numpy as np

n_zero=int(input('Insert the amount of 0:  '))
n_one =int(input('Insert the amount of 1: '))
n_two =int(input('Insert the amount of 2: '))
n_three = int(input('Insert the amount of 3: '))

data = [0]*n_zero + [1]*n_one + [2]*n_two + [3]*n_three
if data==2n-1:
np.random.shuffle(data)
datastring = ''.join(map(str, data))

files = open('decode.txt', 'w')
files.write(datastring)
files.close()

print ("Data string is : %s " % datastring )

else:
print (error)

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