Splitting lines ang grouping three at once

Splitting lines ang grouping three at once - Printable Version

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Splitting lines ang grouping three at once - samsonite - Jun-21-2019

What I've done, up to now, is successful only for the first group of short.txt database, while my goal is to have some drifts on adjusting iteratively the line tle= data[0]+'\n'+data[1]+'\n'+data[2]+'\n' in order to complete the whole file scanning.
Thx in advance

# --- line6.py ------
with open ("short.txt", "r") as myfile:
    data = myfile.read().splitlines()
tle= data[0]+'\n'+data[1]+'\n'+data[2]+'\n'
print(tle)
#------ OUTPUT ----------    
'''
FALCON 9 DEB
1 44298U 19029BR  19167.86418532  .00001313  00000-0  38063-4 0  9991
2 44298  53.0043  62.2948 0004912  13.4119 346.7015 15.43512957  4901
'''

short.txt

Output:FALCON 9 DEB            
1 44298U 19029BR  19167.86418532  .00001313  00000-0  38063-4 0  9991
2 44298  53.0043  62.2948 0004912  13.4119 346.7015 15.43512957  4901
STARLINK AB             
1 44260U 19029AB  19157.99245370  .01269439  00000-0  29305-1 0  9993
2 44260  53.0001 109.7412 0006821  81.1213 255.2409 15.39387046  2245
STARLINK E              
1 44239U 19029E   19167.13356954 -.00013522  00000-0 -91175-3 0  9994
2 44239  53.0083  69.0416 0002637 113.5217 246.6049 15.05529924  3542
STARLINK P              
1 44248U 19029P   19167.86126092 -.00617922  00000-0 -42907-1 0  9993
2 44248  52.9974  64.8224 0004816  42.9633 317.1731 15.07410453  3682
STARLINK D              
1 44238U 19029D   19167.85872376 -.00444761  00000-0 -30673-1 0  9990
2 44238  52.9982  64.8538 0002160  82.0309 278.0925 15.07669053  2123
STARLINK H              
1 44242U 19029H   19167.72360443 -.01130229  00000-0 -86918-1 0  9993
2 44242  52.9937  65.5606 0008561  56.4128 303.7676 15.04350216  3717

RE: Splitting lines ang grouping three at once - ichabod801 - Jun-21-2019

Note that data[index:(index + 3)] gives the three item list starting at index. You can make a simple loop with range(0, len(data), 3) that gets every three item slice of the list.

RE: Splitting lines ang grouping three at once - samsonite - Jun-21-2019

Error erupts

# --- line6bis.py ------
with open ("short.txt", "r") as myfile:
    data[index:(index + 3)] = myfile.read().splitlines()
tle= data [range(0, len(data), 3)]
print(tle)

Error:C:\Training>python line6bis.py
Traceback (most recent call last):
  File "line6bis.py", line 3, in <module>
    data[index:(index + 3)] = myfile.read().splitlines()
NameError: name 'data' is not defined

RE: Splitting lines ang grouping three at once - ichabod801 - Jun-21-2019

First of all, you didn't make the loop I mentioned, which would come after the file is read. Before the loop you initialize an empty list, and then in the loop you append the slide I mentioned to the new list.

RE: Splitting lines ang grouping three at once - samsonite - Jun-21-2019

Last tentative ... hoping someone helps by writing the solution. Thank you, forum!

# --- line6ter.py ------
with open ("short.txt", "r") as myfile:
	data = ""	
index=0
data[index:(index + 3)] = myfile.read().splitlines()
tle= data [range(0, len(data), 3)]
print(tle)

Error:C:\Training>python line6ter.py
Traceback (most recent call last):
  File "line6ter.py", line 7, in <module>
    data[index:(index + 3)] = myfile.read().splitlines()
ValueError: I/O operation on closed file.

RE: Splitting lines ang grouping three at once - ichabod801 - Jun-21-2019

Hoping someone will read one of my posts some day.