read from txt. file in certain manner

[SchroedingersLion]

Sth wrong with the spaces?

Check that you don't have extra spaces.
use print(repr(row[0])) and print(repr(row[1])) to see what you actually work with.

I have two spaces between the columns. But adding a second space in your code does not seem to work.

Those two commands give (only copied last output lines):

'99.95'
''
'99.96'
''
'99.97'
''
'99.98'
''
'99.99'
''
'100'
''

Where the numbers are the last numbers of my first column. Seems like the second space is the problem then. Can I still make it work? The file is too large for manual removal of the second space character.

[buran]

that means you have more than one space between the two numbers
use row[0] and row[-1] instead. That is assuming you don't have empty spaces after the second number

[snippsat]

Delimiter is default to one character doc.
So for 2 character as you have posted in #7 have to change code so it become one character for delimiter.
Have to use edit post to see two character because you have posted data without code tag.

import matplotlib.pyplot as plt
plt.style.use('ggplot')
import csv
 
x = []
y = []
with open('x_float.txt') as csv_file:    
    plots = csv.reader((line.replace('  ', ' ') for line in csv_file), delimiter=' ')
    for row in plots:
        x.append(float(row[0]))
        y.append(float(row[1]))
 
plt.plot(x,y, label='Loaded from file!')
plt.xlabel('x')
plt.ylabel('y')
plt.title('Graph x y')
plt.legend(loc='upper left', shadow=True, fontsize='large')
plt.show()

[SchroedingersLion]

@buran, Snippsat

Thank you very much guys, both of these ways work! :)