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Python (startswith) reg expression

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Top Forums Shell Programming and Scripting Python (startswith) reg expression
# 8  
Old 05-15-2009
Only rows that begins with digit character!

001;test;test;test
123;test;test;test test;test;test
000;;test;test;test
# 9  
Old 05-15-2009
just use the opposite condition
Code:
...
    if not items[0].isdigit():
...

this statement : data[n-1]= data[n-1]+items , means to append to previous. If you check for digit, then once digit is found , it will append previous line. Obviously, this is wrong. therefore you should check for NOT digit in the first character. make sense? you should also study about Python if you are going to use it. See the Python docs.
# 10  
Old 05-15-2009
I have already tried but the command display the follow error message!

#!/usr/bin/env python

import sys

data=open(sys.argv[1]).read().split("\n")
for n,items in enumerate(data):
if not items[0].isdigit():
data[n-1]= data[n-1]+items
data.pop(n)

print '\n'.join(data)



./python.py text

Traceback (most recent call last):
File "./reconf-rowdata-other-char.py", line 11, in ?
if not items[0].isdigit():
IndexError: string index out of range
# 11  
Old 05-15-2009
you did not do what i said. put your code in code tags!
name your script with a different name. eg myscript.py , and not python.py
here's mine and it works for me
Code:
#!/usr/bin/env python
data=open(sys.argv[1]).read().split("\n")
data=[i for i in data if i != ''] ## add this to get rid of all blank lines
for n,items in enumerate(data):
    if not items[0].isdigit(): # check first character is a digit, ie equivalent to [0-9]
        data[n-1]= data[n-1]+items
        data.pop(n)
print '\n'.join(data)

output:
Code:
# more file
001;test;test;test
123;test;test;test
test;test;test
000;;test;test;test

# ./test.py file
001;test;test;test
123;test;test;testtest;test;test
000;;test;test;test

most probably, you have blank lines in your file
Last edited by ghostdog74; 05-15-2009 at 12:46 PM..
# 12  
Old 05-15-2009
I believe you but I can't make work out!

$ ./test.py text
Traceback (most recent call last):
File "./test.py", line 5, in ?
if not items[0].isdigit(): # check first character is a digit, ie equivalent to [0-9]
IndexError: string index out of range

$ cat test.py
#!/usr/bin/env python
import sys
data=open(sys.argv[1]).read().split("\n")
for n,items in enumerate(data):
if not items[0].isdigit(): # check first character is a digit, ie equivalent to [0-9]
data[n-1]= data[n-1]+items
data.pop(n)
print '\n'.join(data)

$ python -V
Python 2.4.3
# 13  
Old 05-15-2009
cat text

001;test;test;test;
123;test;test;test
;test;test;test
000;;test;test;test;
# 14  
Old 05-15-2009
see my code again. i added something. and for the last time, put your code in code tags!!
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