pay attention to Ryan. Do not use 'str' as an identifier as you will over write the built-in doing so. this seems easiest so far.
s = "tyrtrbd =ffgtyuf == =tyryr =u=p ttttff"
s = s.replace('=', '=#')
print s # -> tyrtrbd =#ffgtyuf =#=# =#tyryr =#u=#p ttttff
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