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How do I check that my input doesn't have incorrect characters?
In this program, we ask people to input a three letter codon. This input must only have the letters a,c,g,u in it. How do I chec...
13 years 前 | 2 个回答 | 0
2
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How can I make my function or variable defined if it is undefined?
Trying to run a code but it keeps giving me the error that 'cr' is undefined. I don't know why. R=input('Enter the R value ...
13 years 前 | 1 个回答 | 0
