Is this how to generate a bitcoin address with python? So I have already the public key. My question is if I'm applying correctly the b58 encoding, since bitcoin uses b58check, and also adds x00 prefix. Can somebody explain me that? Thanks.

import hashlib
import base58

# ECDSA Public Key
base64_str = 'MFYwEAYHKoZIzj0CAQYFK4EEAAoDQgAE7P0EE5amecnYKMlq96RUL3Q+mZJCQrta6iHyjQWtsbbgcBMayhR/CTzDi5j4Fb/wD9EclHt3dpYRyJcl9Rtmug=='

hex_str = base64_str.decode('base64').encode('hex')

sha = hashlib.sha256()
rip = hashlib.new('ripemd160')

sha.update(base64_str.decode('base64'))

rip.update(sha.hexdigest())

# Get address
print base58.b58encode(rip.hexdigest())
If the public key were correct (see Mark's answer), the code is not complete (lacks signature) and contains a hash of an ASCII hexdigest which is not correct.
I'd like to contribute with this implementation of bitcoin address from public key.
It covers the case of both uncompressed and compressed bitcoin addresses (just changing compress_pubkey boolean value).

#!/usr/bin/env python2
# https://en.bitcoin.it/wiki/Protocol_documentation#Addresses

import hashlib
import base58

# ECDSA bitcoin Public Key
pubkey = '0450863ad64a87ae8a2fe83c1af1a8403cb53f53e486d8511dad8a04887e5b23522cd470243453a299fa9e77237716103abc11a1df38855ed6f2ee187e9c582ba6'
# See 'compressed form' at https://en.bitcoin.it/wiki/Protocol_documentation#Signatures
compress_pubkey = False


def hash160(hex_str):
    sha = hashlib.sha256()
    rip = hashlib.new('ripemd160')
    sha.update(hex_str)
    rip.update( sha.digest() )
    print ( "key_hash = \t" + rip.hexdigest() )
    return rip.hexdigest()  # .hexdigest() is hex ASCII


if (compress_pubkey):
    if (ord(pubkey[-2:].decode('hex')) % 2 == 0):
        pubkey_compressed = '02'
    else:
        pubkey_compressed = '03'
    pubkey_compressed += pubkey[2:66]
    hex_str = pubkey_compressed.decode('hex')
else:
    hex_str = pubkey.decode('hex')

# Obtain key:

key_hash = '00' + hash160(hex_str)

# Obtain signature:

sha = hashlib.sha256()
sha.update( key_hash.decode('hex') )
checksum = sha.digest()
sha = hashlib.sha256()
sha.update(checksum)
checksum = sha.hexdigest()[0:8]

print ( "checksum = \t" + sha.hexdigest() )
print ( "key_hash + checksum = \t" + key_hash + ' ' + checksum )
print ( "bitcoin address = \t" + base58.b58encode( (key_hash + checksum).decode('hex') ) )