Re: [Tutor] List manipulation
Dear Kent and Bob,
thank you for your solutions. It helped, however,
based on your suggestions, I intended to solve a
chromosome walking problem. I posted my question on
subject name:
'Limitation of range() function in Walking problem'.
Thanks again.
Sri
--- Kent Johnson <[EMAIL PROTECTED]> wrote:
> Srinivas Iyyer wrote:
> > Thank you Bob for your email.
> > Sorry for the confusion.
> > here is what I ment:
> >
> > test = ['10\t15', '16\t20', '25\t35', '45\t50',
> > '55\t60', '61\t65', '75\t80']
>
> >>> I would get:
> >>> 10 20
> >>> 25 35
> >>> 45 50
> >>> 55 65
> >>> 75 80
>
> Here is my take on it:
>
> test = ['10\t15', '16\t20', '25\t35',
> '45\t50','55\t60', '61\t65', '75\t80']
>
> pairs = [ map(int, x.split('\t')) for x in test ]
>
> i = iter(pairs)
>
> last = i.next()
>
> for current in i:
> if current[0] == last[1]+1:
> last = [last[0], current[1]]
> else:
> print last
> last = current
>
> print last
>
>
> You can also wrap this in a generator which yields
> the desired pairs, so
> they can be printed or put in a list or whatever:
>
> def compress(pairs):
> i = iter(pairs)
>
> last = i.next()
>
> for current in i:
> if current[0] == last[1]+1:
> last = [last[0], current[1]]
> else:
> yield last
> last = current
>
> yield last
>
>
> for pair in compress(pairs):
> print pair
>
>
> Kent
>
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>
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Re: [Tutor] List manipulation
Srinivas Iyyer wrote:
> Thank you Bob for your email.
> Sorry for the confusion.
> here is what I ment:
>
> test = ['10\t15', '16\t20', '25\t35', '45\t50',
> '55\t60', '61\t65', '75\t80']
>>> I would get:
>>> 10 20
>>> 25 35
>>> 45 50
>>> 55 65
>>> 75 80
Here is my take on it:
test = ['10\t15', '16\t20', '25\t35', '45\t50','55\t60', '61\t65', '75\t80']
pairs = [ map(int, x.split('\t')) for x in test ]
i = iter(pairs)
last = i.next()
for current in i:
if current[0] == last[1]+1:
last = [last[0], current[1]]
else:
print last
last = current
print last
You can also wrap this in a generator which yields the desired pairs, so
they can be printed or put in a list or whatever:
def compress(pairs):
i = iter(pairs)
last = i.next()
for current in i:
if current[0] == last[1]+1:
last = [last[0], current[1]]
else:
yield last
last = current
yield last
for pair in compress(pairs):
print pair
Kent
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Re: [Tutor] List manipulation
try this:
>>> test = ['10\t15', '16\t20', '25\t35', '45\t50','55\t60', '61\t65',
'75\t80']
>>> t='\t'.join(test).split('\t')
>>> t
['10', '15', '16', '20', '25', '35', '45', '50', '55', '60', '61', '65',
'75', '80']
>>> t2=[int(i) for i in t]
>>> t2
[10, 15, 16, 20, 25, 35, 45, 50, 55, 60, 61, 65, 75, 80]
>>> l= t2[0]
>>> for i in range(1,len(t2)-1,2):
... if t2[i+1]-t2[i]>1:
... print l, '\t', t2[i]
... l = t2[i+1]
10 20
25 35
45 50
55 65
>>> print l, '\t', t2[-1]
75 80
--
Bob Gailer
510-978-4454
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Re: [Tutor] List manipulation
Thank you Bob for your email.
Sorry for the confusion.
here is what I ment:
test = ['10\t15', '16\t20', '25\t35', '45\t50',
'55\t60', '61\t65', '75\t80']
>>> x = []
>>> y = []
>>> for m in test:
... cols = m.split('\t')
... x.append(cols[0])
... y.append(cols[1])
...
>>> x
['10', '16', '25', '45', '55', '61', '75']
>>> y
['15', '20', '35', '50', '60', '65', '80']
>>> for m in range(0,6):
... k = m+1
... if int(x[k])-int(y[m])==1:
... print x[m]+'\t'+y[k]
... else:
... print x[m]+'\t'+y[m]
...
10 20
16 20 # This is unwanted #
25 35
45 50
55 65
61 65# This is unwanted #
75 80 # IS MISSING from result###
16-20 and 61-65 is unwanted, to get rid of these I am
doing these.
My desired result:
10 20
25 35
45 50
55 65
75 80
If I consider the length of the list:
>>> for m in range(0,7):
... k = m+1
... if int(x[k])-int(y[m])==1:
... print x[m]+'\t'+y[k]
... else:
... print x[m]+'\t'+y[m]
...
10 20
16 20
25 35
45 50
55 65
61 65
Traceback (most recent call last):
File "", line 3, in ?
IndexError: list index out of range
How can I avoid 16-20 and 61-65 and get 75-80 in the
result.
Also, is there any easy way to do this.
Thanks
--- Bob Gailer <[EMAIL PROTECTED]> wrote:
> Srinivas Iyyer wrote:
> > Dear group:
> >
> > I have a data like this:
> > 10 15
> > 16 20
> > 25 35
> > 45 50
> > 55 60
> > 61 65
> > 75 80
> >
> > Since 15 precedes 16, I want to consider 10:20 as
> one
> > unit. If I repeat completely for data
> >
> > I would get:
> > 10 20
> > 25 35
> > 45 50
> > 55 65
> > 75 80
> >
> > test = ['10\t15', '16\t20', '25\t35', '45\t50',
> > '55\t60', '61\t65', '75\t80']
> >
> >
> > I cannot think a way to do this in simple. Could
> > members suggest some way to solve this please.
> >
> I assume by "precedes" you mean is one-less-than. To
> test this you
> should convert the strings into integers. Since the
> numbers come in
> pairs each pair must be split at the \t (using
> split), then convert each
> number to integer (using int).
>
> Hope that's enough to get you started.
>
> --
> Bob Gailer
> 510-978-4454
>
>
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Re: [Tutor] List manipulation
Srinivas Iyyer wrote: > Dear group: > > I have a data like this: > 10 15 > 16 20 > 25 35 > 45 50 > 55 60 > 61 65 > 75 80 > > Since 15 precedes 16, I want to consider 10:20 as one > unit. If I repeat completely for data > > I would get: > 10 20 > 25 35 > 45 50 > 55 65 > 75 80 > > test = ['10\t15', '16\t20', '25\t35', '45\t50', > '55\t60', '61\t65', '75\t80'] > > > I cannot think a way to do this in simple. Could > members suggest some way to solve this please. > I assume by "precedes" you mean is one-less-than. To test this you should convert the strings into integers. Since the numbers come in pairs each pair must be split at the \t (using split), then convert each number to integer (using int). Hope that's enough to get you started. -- Bob Gailer 510-978-4454 ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
[Tutor] List manipulation
Dear group: I have a data like this: 10 15 16 20 25 35 45 50 55 60 61 65 75 80 Since 15 precedes 16, I want to consider 10:20 as one unit. If I repeat completely for data I would get: 10 20 25 35 45 50 55 65 75 80 test = ['10\t15', '16\t20', '25\t35', '45\t50', '55\t60', '61\t65', '75\t80'] I cannot think a way to do this in simple. Could members suggest some way to solve this please. thanks __ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
