#1 1.1 Write a Python program with a loop that prints out a sequence
of numbers as follows:151311...31-1
A simple approach with a for loop:
def MyRange(start, end, step):
for n in range(start, end, step):
if n == 0:
print -1
break
else:
print n
return
#call the function
MyRange(151311, -1, -31)
Hope that helps!
2010/1/31 <tutor-requ...@python.org>:
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> Today's Topics:
>
> 1. Re: can any one help (invincible patriot)
> 2. Re: can any one help (Grigor Kolev)
> 3. please help me (invincible patriot)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Sat, 30 Jan 2010 23:24:18 +0000
> From: invincible patriot <invincible_patr...@hotmail.com>
> To: <grigor.ko...@gmail.com>
> Cc: tutor@python.org
> Subject: Re: [Tutor] can any one help
> Message-ID: <col107-w13c745249b64f8355e768ae2...@phx.gbl>
> Content-Type: text/plain; charset="windows-1251"
>
>
> ???? didnt got what u replied
>
>
> Subject: Re: [Tutor] can any one help
> From: grigor.ko...@gmail.com
> To: invincible_patr...@hotmail.com
> CC: anand.shash...@gmail.com; tutor@python.org
> Date: Sun, 31 Jan 2010 01:21:15 +0200
>
>
>
>
>
>
>
>
>
>
> ? 22:49 +0000 ?? 30.01.2010 (??), invincible patriot ??????:
>
>
> ya definately, just give me the hint
>
>
> i made a prog for the first one but it when ran, saying RESTART in active
> shell
>
>
>
>
>
>
>
>
> def fibn(n):
>
>
> a,b=15,2
>
>
> while a>n:
>
>
> print a,
>
>
> a,b=a,a+b
>
>
> fibn(-1)
>
>
>
>
>
>
>
>
> whatz rong in this prog that the error is saying no break point
>
>
>
>
>
>
>
>
> thanks
>
>
>
>
>
> From: anand.shash...@gmail.com
>
> Date: Sun, 31 Jan 2010 04:16:40 +0530
>
> Subject: Re: [Tutor] can any one help
>
> To: invincible_patr...@hotmail.com
>
> CC: tutor@python.org
>
>
>
> I got the question. I just gave you hints, so as you can try yourself.
> Also please use 'Reply all'
>
>
>
>
>
> On Sun, Jan 31, 2010 at 4:08 AM, invincible patriot
> <invincible_patr...@hotmail.com> wrote:
>
>
>
> I want to use WHILE LOOP in the first one and in the second question
> we need to take a string 'foobar' and then we should make the prog to get the
> following out put
>
>
>
>
> let me tel u the exact question
>
>
>
>
>
>
>
>
>
>
>
>
> Write a small Python program that generates the list of all pairs of
> characters c and
>
>
>
>
> its doubling 2 c, where c moves through all the letters of the string
> "foobar" and prints it out.
>
>
>
>
> The result will look like:
>
>
>
>
> [(?f?, ?ff?), (?o?, ?oo?), (?o?, ?oo?), (?b?, ?bb?), (?a?, ?aa?),
> (?r?, ?rr?)]
>
>
>
>
>
>
>
>
>
>
>
>
> thatz the exact 2nd question
>
>
>
>
> also let me know aboutthe first one
>
>
>
>
>
>
>
>
>
>
>
>
> thanks allot
>
>
>
>
>
>
>
>
>
>
> From: anand.shash...@gmail.com
>
>
>
>
>
>
>
> Date: Sun, 31 Jan 2010 04:05:09 +0530
>
>
>
>
>
>
> Subject: Re: [Tutor] can any one help
>
> To: invincible_patr...@hotmail.com
>
> CC: tutor@python.org
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
> Tips:
>
>
>
> 1.
>
> range can be stepped down in reverse order
>
> ex ->
>
> >>> range(10, 1, -2)
>
> [10, 8, 6, 4, 2]
>
>
>
> 2.
>
> you can directly get chars of string.
>
> ex ->
>
> >>> [i for i in 'foobar']
>
> ['f', 'o', 'o', 'b', 'a', 'r']
>
> also
>
> >>> 2 * 'f'
>
> 'ff'
>
>
>
>
>
>
>
>
>
> On Sun, Jan 31, 2010 at 3:56 AM, Shashwat Anand
> <anand.shash...@gmail.com> wrote:
>
>
> seems like homework ;)
>
> Can you paste your approach here ?
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
> On Sun, Jan 31, 2010 at 3:03 AM, invincible patriot
> <invincible_patr...@hotmail.com> wrote:
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
> hi
>
>
>
>
>
>
>
>
> i am stuck in few tasks can some one help me in that
>
>
>
>
>
>
>
>
> here are first few tasks
>
>
>
>
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>
>
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>
> 1
>
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>
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>
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> how can i print the following series, using a loop
>
>
>
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>
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>
>
> 15
>
>
>
>
>
>
>
>
> 13
>
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> 11
>
>
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> ...
>
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> 3
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> 1
>
>
>
>
>
>
>
>
> -1
>
>
>
>
>
>
>
>
> ========
>
>
>
>
>
>
>
>
> 2
>
>
>
>
>
>
>
>
> Write a small Python program that generates the list of all
> pairs of characters c and
>
>
>
>
>
>
>
>
> its doubling 2 c, where c moves through all the letters of the
> string "foobar" and prints it out.
>
>
>
>
>
>
>
>
> The result will look like:
>
>
>
>
>
>
>
>
> [(?f?, ?ff?), (?o?, ?oo?), (?o?, ?oo?), (?b?, ?bb?), (?a?,
> ?aa?), (?r?, ?rr?)]
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
> please help me out in these two tasks
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
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>
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>
>
> _______________________________________________
>
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>
>
>
>
>
> def fibn(n):
>
> a,b=15,2
>
> while a>n:
>
> print a, # it is same like print a, a, b = a, a+b
> You can not print this. SyntaxError: invalid syntax
>
> a,b=a,a+b
>
> fibn(-1)
>
>
>
>
> --
>
> Grigor Kolev <grigor.ko...@gmail.com>
>
>
>
> _________________________________________________________________
> Hotmail: Powerful Free email with security by Microsoft.
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> ------------------------------
>
> Message: 2
> Date: Sun, 31 Jan 2010 01:40:41 +0200
> From: Grigor Kolev <grigor.ko...@gmail.com>
> To: invincible patriot <invincible_patr...@hotmail.com>
> Cc: tutor@python.org
> Subject: Re: [Tutor] can any one help
> Message-ID: <1264894841.6587.39.ca...@dedal-laptop>
> Content-Type: text/plain
>
> Excuse me but I have question too.
> Why when i write this function in python shell not work says
> SyntaxError: invalid syntax
> but when I use IDLE make endless loop
> Sorry I also teach Python.
>> def fibn(n):
>> a,b=15,2
>> while a>n:
>> print a, # it is same like print a, a, b = a, a+b
>> You can not print this. SyntaxError: invalid syntax
>> a,b=a,a+b
>> fibn(-1)
> --
> Grigor Kolev <grigor.ko...@gmail.com>
>
>
>
> ------------------------------
>
> Message: 3
> Date: Sat, 30 Jan 2010 23:46:30 +0000
> From: invincible patriot <invincible_patr...@hotmail.com>
> To: <tutor@python.org>
> Subject: [Tutor] please help me
> Message-ID: <col107-w365777c651fe3fff81459ce2...@phx.gbl>
> Content-Type: text/plain; charset="windows-1252"
>
>
> hii am stuck in these questions can someone please help me in solving and
> writing programme for these tasks
> please help me
>
>
>
>
> 1 1.1 Write a Python program with a loop that prints out a sequence of
> numbers as follows:151311...31-1
>
> 1.2 Write a small Python program that generates the list of all pairs of
> characters c andits doubling 2 c, where c moves through all the letters of
> the string "foobar" and prints it out.The result will look like:[(?f?, ?ff?),
> (?o?, ?oo?), (?o?, ?oo?), (?b?, ?bb?), (?a?, ?aa?), (?r?, ?rr?)]Hint: use
> list comprehensions.
> 1.3 Write a small Python program that
> 1. prints out the length of the
> string?taumatawhakatangihangakoauauotamateaturipukakapikimaungahoronukupokaiwhenuakitanatahu?
> 2. prints out how many different characters this string contains
> 3. replaces all the non-?t? characters in above string with dots ?.?. So, if
> the word were?tattoo?, it would print ?t.tt..?.Hints:
> (a) use a function to t-ify the string
> (b) there are various ways to construct the string, either using the join
> method or by runninga loop accumulating substrings.
> (c) check also out what happens if you apply the conversion list(s) to a
> string s.
> 2 2.1 Write a function count char(s, c) that takes a string s, and a
> character c and returnshow often the character c appears in the string.For
> example count_char("tattoo", "t") should return 3.
>
> 2.2 Write a Python function char_freqency(s)that returns a dictionary which,
> for eachcharacter of s as a key, stores as value how often this character
> appears.For example, char_frequency("tattoo") could return {?a?: 1, ?t?: 3,
> ?o?: 2} (the order ofkey:value pairs does not matter here).
> Hint: Consider using the function count_char defined in 2.1.
> 2.3 Write a program that translates a given string (of arbitrary length) of
> DNA bases intothe RNA strand that it will produce. For this, research which
> DNA bases correspond to RNA basesand create a translation table (not an
> if...else clause!) in the Python program. [4 marks]
>
>
> 3
> 3.1 consider the following list of base
> sequences:ACGTACCTTACTTACCATATCGTACCTCTTACTCATThe task consists of writing a
> Python program that performs a simple alignment algorithm onthese two strings
> and prints out this alignment in a suitable readable form. Give a brief
> commentexplaining the output format.Hints:1. Matching means the following:
> for a given sequence to be matched, your program should denotewhich bases
> correspond to bases in the reference sequence and which do not; in addition,
> markgaps where the reference sequence contains bases which are not present in
> the sample sequence.For a given sample sequence, your matching algorithm will
> attempt to match as many basesas possible to those of the reference
> sequence.2. This is a difficult assignment. Do not attempt it before you have
> solved the others.3. For this purpose, you are allowed to research and
> implement publicly documented versions ofthe Needleman-Wunsch algorithm or
> similar algorithms (however, make sure that you r
> efer-ence them properly!). Also make sure that your program prints out the
> matches/mismatchesbetween the sequences. You should demonstrate at least two
> different alignments by usingdifferent gap penalties.Instead of following
> this hint, you can develop an alternative solution to the matching
> problem,e.g. based on the Levenshtein distance.
>
>
> please help me
> _________________________________________________________________
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