The information in DNA is stored as a code made up of four chemical bases which are represented by four upper case letters A$,$ T$,$ G$,$ C$.$ An example DNA

sequence could be : ATGAG.

An interesting phenomena here is that when two DNA sequences are attempted to combine, A can only pair with $T$ whereas $G$ can only pair with $C.$

Two DNA sequences for example ATGC and TACG are considered 'fully complementary' because the bases $($letters$)$ in every index position can be

paired to each other $($see the image$).$

Fully Complementary

SNP

Non Complementary

Two DNA sequences for example ATGC and TACC are considered $\text{'}$SNP type' because there is exactly one index position $($last position in this case$)$ in

which the bases$($letters$)$ can not be paired.

Two DNA sequences for example ATGC and TTCA are considered 'non complementary' because there are more than one index position $($second and

fourth in this case$)$ in which the bases can not be paired.

Write a program that will ask the user to input two DNA Sequences. The program must check the following:

The first sequence must contain letters only, the letters must be upper case, it must contain only $A,T,G,C$ letters$)$

The second sequence must satisfy the same requirementrs as sequence $1>ln$ additon to that it maust have the same length as sequnce $1.$

If any of the above condition is violated, the program will prompt the user to correct his$/$her input

With two valid DNA Sequences codes the program will try to identify if the given sequences are 'Fully Complementary', 'Non Complementary', $\text{'}$SNP type'

Suggestive Steps:

a$.$ Accept two DNA sequences from the user as strings and validate them as shown above

b$.$ scan through the index position $(0$ to length$-1)$ of both the strings

c$.$ in every index position match the letters from the two strings

d$.$ if the letters in a position are $\text{'}$A$\text{'}$ vs $\text{'}T\text{'}$ or $\text{'}T\text{'}v{s}^{\text{'}}{A}^{\text{'}}$ or $\text{'}G\text{'}v{s}^{\text{'}}{C}^{\text{'}}$ or $\text{'}C\text{'}v{s}^{\text{'}}G\text{'}$ they are considered as pair

e$.$ keep a count of no$.$ of pairings to finally decide if the sequences are fully complementary, SNP or non complementarySample run #$1$

Enter the DNA Sequence $1$:ATGC

Enter the DNA Sequence $2$:AAAA

The sequences are non complementary

Sample run #$2$

Enter the DNA Sequence $1$:AATTG

Enter the DNA Sequence $2$: TTAAC

The sequences are fully complementary

Sample run #$3$

Enter the DNA Sequence $1$:GCCTA

Enter the DNA Sequence $2$:CGAAT

The sequences are SNP type

Sample run #$4$

Enter the DNA Sequence $1$ : ase

Please input uppercase letters

Enter the DNA Sequence $1$:ASE

Please input only letters: A$,$ T$,$ G$,$ C

Enter the DNA Sequence $1$:GCCCA

Enter the DNA Sequence $2$:$123$

Please input only letters

Enter the DNA Sequence $2$:$1$AS

Please input only letters

Enter the DNA Sequence $2$:CTTA

sequence $2$ must have same length of sequence $1$

Enter the DNA Sequence $2$:CTTAA

The sequences are non complementary

#$\%\%$witefile

HW$2$Q$2.$py

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