如何在浮点数 Python 中转换行字符串

Question

I have a string line like this way:

f=open(flowsrc.baseflowpath+flowsrc.baseflowfile,"r")
lines=f.readlines()[1:] #jump the first line
result=[]
for x in lines:
    result.append(x.split(' ')[0])
f.close()
print x, type(x)

out: 19     0       1.8881      .4928
out: <type 'str'>

How can I put the elements of x in array in float format? like this:

a = [19.0]
b = [0.0]
c = [1.8881]
d = [0.4928]

Answer 1

Given the example str from your question x = '19 0 1.8881 .4928' , you can use the following comprehension to unpack each value as a float into a list ( nums ) for processing as required.

nums = [ float(i) for i in x.split(' ') if i != '' ]

If you want to unpack each value to its own list as outlined in your question:

a = [nums[0]]
b = [nums[1]]
c = [nums[2]]
d = [nums[3]]

Answer 2

Just change your line from:

result.append(x.split(' ')[0])

to:

result.append(float(x.split(' ')[0]))