Module 4
String length
How many characters are in a string.
Measuring text
The len() function counts the number of characters in a string. For a DNA sequence, this is the number of bases.
Python
seq = "ATGCGTA" print(len(seq))
→ 7
1A
2T
3G
4C
5G
6T
7A
Each box holds one character. len() counts them.
Your task
Measure a sequence
- Store ATGCGTA in a variable and print its length.