try:
    import ubinascii as binascii
except ImportError:
    import binascii

print(binascii.a2b_base64(b''))
print(binascii.a2b_base64(b'Zg=='))
print(binascii.a2b_base64(b'Zm8='))
print(binascii.a2b_base64(b'Zm9v'))
print(binascii.a2b_base64(b'Zm9vYg=='))
print(binascii.a2b_base64(b'Zm9vYmE='))
print(binascii.a2b_base64(b'Zm9vYmFy'))

print(binascii.a2b_base64(b'AAECAwQFBgc='))
print(binascii.a2b_base64(b'CAkKCwwNDg8='))
print(binascii.a2b_base64(b'f4D/'))
print(binascii.a2b_base64(b'MTIzNEFCQ0RhYmNk'))

try:
    print(binascii.a2b_base64(b'abc'))
except:
    print("caught")
try:
    print(binascii.a2b_base64(b'abcde='))
except:
    print("caught")
try:
    print(binascii.a2b_base64(b'ab*d'))
except:
    print("caught")
try:
    print(binascii.a2b_base64(b'ab=cdef='))
except:
    print("caught")