将分数转换为浮点数？

我稍微调整了詹姆斯的回答。

def convert_to_float(frac_str):    try:        return float(frac_str)    except ValueError:        num, denom = frac_str.split('/')        try: leading, num = num.split(' ') whole = float(leading)        except ValueError: whole = 0        frac = float(num) / float(denom)        return whole - frac if whole < 0 else whole + fracprint convert_to_float('3') # 3.0print convert_to_float('3/2') # 1.5print convert_to_float('1 1/2') # 1.5print convert_to_float('-1 1/2') # -1.5

http://ideone.com/ItifKv