Casting str in Scientific Notation to Float fails only on Positive numbers in Python -


i reading in couple of columns text file (delimited 3 spaces reason)

the columns in scientific notation. first column has mixture of positive , negative numbers.

when casting float in segment: 

    count = 0     curfile = open(curfile, "r")         row in curfile.readlines():        if count > (row_first-1) , count < row_last:            line = row.split('   ')            x.append(float(line[0]))           print line[0]            y.append(float(line[1]))            count = count + 1        else:            count = count + 1

it fails when switching negative row positive row first column

-3.0000000e+00   5.5100000e+02   2.6600000e+02   0.0000000e+00    -1.0000000e+00   5.5100000e+02   2.6600000e+02   0.0000000e+00     1.0000000e+00   5.5100000e+02   2.6600000e+02   0.0000000e+00

so in case convert -1(the second row) not 1(the third row). when appending values y positive, problem not occur.

i thought maybe there blank space before positive numbers "-" sign using lstrip() on string did not help.

i totally perplexed issue , appreciate ideas.

edit: exception gets thrown when run program: 

traceback (most recent call last):   file "u:\scripts\flow3d_script\flow_3d.py", line 93, in <module>     x.append(float(line[0])) valueerror: not convert string float:

this guess, but...

could there 3 spaces @ start of negative lines too? cause split return list empty string @ start.

to resolve should lstrip() entire line before splitting. , way, if split() no arguments defaults "split number of spaces", don't have worry number of spaces.


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