PercentGC

# What is the percent GC content of a DNA molecule?
# Problem: the string of sequences doesn't wrap around
#Problem: not printing in a nice sentence format.
pBR322 = ('TTCTCATGTTTGACAGCTTATCATCGATAAGCTTTAATGCGGTAGTTTATCACAGTTAAATTGCTAACGCAGTCAGGCAC')

Gcount = 0
for char in pBR322:
    if char =='G':
        Gcount = Gcount+1
print('G equals')
print(Gcount)
Acount = 0
for char in pBR322:
    if char =='A':
        Acount = Acount+1
print('A equals')
print(Acount)
Ccount = 0
for char in pBR322:
    if char =='C':
        Ccount = Ccount+1
print('C equals')
print(Ccount)
Tcount = 0
for char in pBR322:
    if char =='T':
        Tcount = Tcount+1
print('T equals')
print(Tcount)

PercentGC = ((Gcount+Ccount)/(Acount+Tcount+Ccount+Gcount))*100
print(PercentGC)