如何将数字乘以列表中科学记数法表示的每个元素？

Question

我有一个data.txt：

1.30000E+01 7.49106E+01

1.40000E+01 7.24673E+01

...

我想将第一列乘以2.这是我的代码：

with open("data.txt") as f:
data = f.readlines()

xtemp = [row.split()[0] for row in data]
y = [row.split()[1] for row in data]
x = [i * 2 for i in xtemp]

错误信息是

eError: invalid literal for float():1.30000E+011.30000E+01

Answer 1

从文件读取的数据是string类型。你需要转换为float to multiply：

x = [float(i) * 2 for i in xtemp]

import io

filedata = """1.30000E+01 7.49106E+01
1.40000E+01 7.24673E+01"""

data = [i.strip("\n") for i in io.StringIO(filedata).readlines()]

xtemp = [row.split()[0] for row in data]
y = [row.split()[1] for row in data]
xtype = [type(i) for i in xtemp] # [str,str] <-- here is your problem
x = [float(i) * 2 for i in xtemp]


x

返回

[26.0, 28.0]