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Engineering LibreTexts

6.E: Strings (Exercises)

Exercise 5: Take the following Python code that stores a string:`

str = 'X-DSPAM-Confidence:0.8475'

Use find and string slicing to extract the portion of the string after the colon character and then use the float function to convert the extracted string into a floating point number.

Exercise 6:


Read the documentation of the string methods at

You might want to experiment with some of them to make sure you understand how they work. strip and replace are particularly useful.

The documentation uses a syntax that might be confusing. For example, in find(sub[, start[, end]]), the brackets indicate optional arguments. So sub is required, but start is optional, and if you include start, then end is optional.

  1. A tuple is a sequence of comma-separated values inside a pair of parenthesis. We will cover tuples in Chapter 10