Pattern check (Edexcel GCSE Computer Science): Flashcards
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Pattern checking definition
Pattern checking definition
Validating that user input matches expected format/rules
Purpose of pattern checking
Purpose of pattern checking
Prevents errors & ensures data integrity in programs
len() function purpose
len() function purpose
Returns number of characters in a string
isalpha() function purpose
isalpha() function purpose
Checks if character is a letter (A-Z or a-z)
isdigit() function purpose
isdigit() function purpose
Checks if character is a number (0-9)
Python zero-based indexing rule
Python zero-based indexing rule
First character is at position [0], not [1]
First validation step in pattern checking
First validation step in pattern checking
Check overall length to prevent index errors
Purpose of nested if statements in validation
Purpose of nested if statements in validation
Organize logic; each check only runs if previous passed
String concatenation in validation
String concatenation in validation
Building up strings by adding characters one at a time
Benefit of specific error messages
Benefit of specific error messages
Tell user exactly what went wrong, easier to fix input
Edge cases to test in validation
Edge cases to test in validation
Empty input, too short/long, unexpected characters
Why use meaningful variable names
Why use meaningful variable names
Makes code easier to understand than generic names