Hi I`m currently working on a small project for school and the task is to write a function which takes a dna strand and a position and checks whether the DNA is complement before and after the picked position. this is the code i came up with so far. the translate function is just to check complementarity and it workes just fine. but if i try to feed a DNA to the lis function, i get an error.
File "xxx", line 37, in lis
while translate(dna[pos(1-i)],dna[pos(1+i)])=="TRUE":
TypeError: 'int' object is not callable
does anybody know what is going wrong there?
def translate(seq, comp):
#matchlist and checklist
basecomplement = {'A': 'T', 'C': 'G', 'G': 'C', 'T': 'A'}
baselist = ["A","T","G","C"]
#check wether the input is a DNA
if seq not in baselist:
print("FALSE")
elif comp not in baselist:
print("FALSE")
#check if the two (or more) bases are complements
else:
aaseq = []
comp = [comp]
for character in seq:
aaseq.append(basecomplement[character])
print(aaseq)
#print result
if aaseq == comp:
print("TRUE")
else:
print("FALSE")
def lis(dna, pos):
#make a list from DNA input
dna = [dna]
#go to pos in DNA list
for pos in range(len(dna)):
i=1
#check if position before and after pos are complements
#and advance a position if true else stop
while translate(dna[pos(1-i)],dna[pos(1+i)])=="TRUE":
i+=1
return(pos-i + pos+i)
break
A few things for you to fix in here...
pos is an integer, not a function so pos(1-i) is causing the error in your post. This should be something like dna[pos-1] and dna[pos+1]range starts at 0 so 0-1 is going to be -1 and will throw an out of range error as welltranslate() isn't returning anything, only printing. You need return ("TRUE"). You'd also be better off using boolean True and False here instead of strings.I didn't go through your entire snippet, so there may be more quirks...