CODEWITHSUNDEEP
pythonpython-2.7
Kan
Kan

Reputation: 169

Python: split a string line

I have wrote the following code to split a line, what I was trying to do is to get the 1.802e+05 and 1.739e+04. I think I can split the line with space, then I can get those values, but what I got so far is only the letter H. Anyone can show me where my bug is?

line = 'Htin     1.802e+05 [J kg^-1]    Htout    1.739e+04 [J kg^-1]'
line.split(' ')
print line[0]

Upvotes: 2

Views: 651

Answers (6)

Alex Martelli
Alex Martelli

Reputation: 881635

Personally, I'd skip the split and go right for a re solution -- e.g if every number you want to extract is in exponential notation,

numstrings = re.findall(r'\d\.\d+e[+-]\d+', line)

would work. Just adjust the RE pattern to the forms of numbers you want to extract!

Upvotes: 2

Karl
Karl

Reputation: 3464

line.split() will return a result which you are not storing anywhere. Using line[0] will give you the character at index 0 in the string line.

This should be more what you want:

>>> line = 'Htin     1.802e+05 [J kg^-1]    Htout    1.739e+04 [J kg^-1]'
>>> lines = line.split()
>>> lines
['Htin', '1.802e+05', '[J', 'kg^-1]', 'Htout', '1.739e+04', '[J', 'kg^-1]']
>>> lines[1]
'1.802e+05'
>>> lines[5]
'1.739e+04'

Upvotes: 1

dawg
dawg

Reputation: 103834

You can use try/except:

>>> line = 'Htin     1.802e+05 [J kg^-1]    Htout    1.739e+04 [J kg^-1]'
>>> result=[]
>>> for e in line.split():
...    try:
...       result.append(float(e))
...    except ValueError:
...       pass
... 
>>> result
[180200.0, 17390.0]

Upvotes: 1

GLHF
GLHF

Reputation: 4035

import re

line = 'Htin     1.802e+05 [J kg^-1]    Htout    1.739e+04 [J kg^-1]'
a=line.split()
for x in a:
    if re.findall("[0-9][0-9]",x):
        print (x)

Output:

>>> 
1.802e+05
1.739e+04
>>>

re module for search what you want.

Upvotes: 0

Scott Hunter
Scott Hunter

Reputation: 49803

Split doesn't alter line; it returns a list of strings. But even if it did, line[0] wouldn't give you one of the numbers.

Upvotes: 1

newbie5074
newbie5074

Reputation: 49

line.split() return the result, which you haven't stored anywhere. So, that line has no effect. In the next line, line is still the string, so line[0] is H

line = 'Htin 1.802e+05 [J kg^-1] Htout 1.739e+04 [J kg^-1]' temp = line.split(' ') print temp[0]

Upvotes: 2

Related Questions