将列表的空字符串转换为浮点型

lst = ["3.14", "", "2.718", "", "0.618"]
result = [float(x) if x != "" else None for x in lst]

lst = ["3.14", "", "2.718", "", "0.618"]
result = []
for x in lst:
    if x != "":
        result.append(float(x))
    else:
        result.append(None)

lst = ["3.14", "", "2.718", "", "0.618"]
result = []
for x in lst:
    try:
        result.append(float(x))
    except ValueError:
        result.append(None)