Python, Determine if a string should be converted into Int or Float

by 
def isfloat(x):
    try:
        a = float(x)
    except (TypeError, ValueError):
        return False
    else:
        return True

def isint(x):
    try:
        a = float(x)
        b = int(a)
    except (TypeError, ValueError):
        return False
    else:
        return a == b

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