Category Python String

Converting a Python string to uppercase gives it an uppercase form. Python’s str.upper() method returns a copy of a string with its cased characters converted to uppercase. I’ll show how to call str.upper() and what happens to the original string…

To work with a name or message in a Python program, you need a value that represents text. Python uses strings, values of the built-in str type, to hold text. I’ll show how to read and transform strings, then use…

A tuple can hold values that need to appear as text in a log or output field. Python’s join() method combines string values with a separator, while str() turns a tuple into its Python-style representation, including punctuation. I’ll show how…

Text in a program may need a small change or check before you use it. Python string methods are operations you call on text to trim its edges or split it into parts. I’ll show how to choose a method…

`”banana”.find(“pear”)` returns `-1` when the text is absent. I’m fascinated that a failed search has a clear result, while `-1` can still act as a valid slice position. You can separate the idea of a text fragment from the operation…

The call `'{:.2f}’.format(12.3456)` returns the string `’12.35’`. I find that pairing useful: the format string keeps the display rule beside its input. You can understand the returned text by looking at the rule inside the format expression. You can also…

Calling `”Python python PYTHON”.replace(“python”, “Ruby”)` changes only the lowercase match. I appreciate the `count` argument because it caps how many matches change. Pass the old and new text to `str.replace()` and check the returned string. Compare that returned string with…

Debug prints all repeat the same chore, because the variable name gets typed once as a label and once as the value. The f-string shorthand prints both from a single expression, so the label can never drift out of sync…

Every list of strings eventually needs to become one string, and the line that does it reads backwards. The separator calls the method while the list supplies the items, so a comma-joined row comes out as a one-liner once you…

I ran into this problem during a data migration when a colleague handed me a CSV full of product codes like “SKU-4829-A” and “ORD-1034-B” — and I needed to pull out just the numbers for validation. Manual extraction was not…