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Adding sentence breaks to the beginning and end of each element in a list [closed]

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I have a list of strings:
mini_corpus = ['I am Sam','Sam I am','I am Sam','I do not like green eggs and Sam']
I need to add a sentence boundary at the beginning and end of each element (i.e. 'BOS I am Sam EOS', 'BOS Sam I am EOS', etc.)
I've tried using map : mini_corpv2 = list(map(lambda x: 'BOS{}EOS'.format(x), mini_corpus)) but it throws 'list' object is not callable
Can anyone tell me what I'm doing wrong or suggest another method to implement this?

I suppose the problem is somewhere else. Your code runs without problems, resulting in
['BOSI am SamEOS',
'BOSSam I amEOS',
'BOSI am SamEOS',
'BOSI do not like green eggs and SamEOS']
(so you will probably want to add spaces after BOS and before EOS).
An alternative solution using list comprehension:
mini_corpv2 = [f'BOS {x} EOS' for x in mini_corpus]

Why am I getting two diferent outputs with my python code? [closed]

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def kaka(name):
r=''
for ch in name:
r=r+ch*3
return r
Output:
>>> kaka('Mississippi')
>>> 'MMMiiissssssiiissssssiiippppppiii'
But for this code:
def kaka(name):
for ch in name:
r=''
r=r+ch*3
return r
I am getting output as: iii

That's because in your second code you're re-assigning r back to the empty string ''. Thus you only get the final character multiplied 3 times (which for Mississippi is i).

You are getting 2 different outputs because in the first code you are initialising the value of r i.e r = '' outside the for loop and in the second program you are initialising value of r inside the for loop.

Split in string and join words under Python [closed]

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I am trying to split and capture the 4 words in a sentence and encountered this error: empty separator?
My codes
s1 = input("Enter 3 random strings, separated by commas:") s1 = s1.split(sep = '') print (s1[4])
Thank you for any advices!

try this
s1 = input("Enter 3 random strings, separated by commas:")
s1 = s1.split(sep = ',')
print (s1)
you didnt have the, in sep==""
hope it helped

there's two error in your code
you may change s1=s1.split(), this will split your words.
and at the end of your code, I think you want to print the lest world?
if so, you may be print(s1[2])
because the python count the list from 0, the first one is 0, the third one is 2,
due to your input is 3 words, so the length of the list is 3.you can also print(s1[-1]), it always print out the last one.

For it not to be an empty separator, you should insert a comma inside the two quotes, or else it will technically be empty. In fact, you don't even need the sep because you could just do .split(",")

Python Regex stops after first "|" match [closed]

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p = re.compile("[AG].{2}[ATG|ATA|AAG].{1}G")
regex_result = p.search('ZZZAXXATGXGZZZ')
regex_result.group()
'AXXATG'
I was expecting AXXATGXG instead.

Use a grouping construct (...) rather than a character class [...] around the alternatives:
p = re.compile("[AG].{2}(?:ATG|ATA|AAG).G")
^^^^^^^^^^^^^^^
The (?:ATG|ATA|AAG) matches 3 sequences: either a ATG, or ATA or AAG. The [ATG|ATA|AAG] character class matches 1 char, either A, T, G or |.
Note the {1} is redundant and can be removed.
Python:
import re
p = re.compile("[AG].{2}(?:ATG|ATA|AAG).G")
regex_result = p.search('ZZZAXXATGXGZZZ')
print(regex_result.group())
# => AXXATGXG
See IDEONE demo

Index into a string in a list [closed]

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Suppose I have a list containing 9 fields, and the 9th field is a string.
Then print(line) will print the entire line, print(line[9]) will return something like:
1/0:.:PASS:90:204,90:201,88:48,39:-204,0,-90:-48,0,-39:14:9,5:5
but print(line[9[0:1]])
will return
File "FileParser.py", line 9, in ?
print(line[9[0:1]])
TypeError: unsubscriptable object
If I assign line[9] to a second var, then I can manipulate it like a string, but this seems like a silly extra step.
Is there a way to index directly into the string while still part of the list?
Thank you

You can index it like this
line[9][0:1]
line[9] will get the actual string and you get the range of characters from that string.
When you do line[9[0:1]] you are trying to get the range of values from the number 9, which is not possible. That is why your code fails.

Since line[9] is a string, then you have to do
line[9][0:1]
Let's say line[9] = "some string". Then you can manipulate it with
line[9][0:1]
which will be equivalent to
"some string"[0:1]