Strings

CSCE 1035

index

an integer matching a specific position in a string’s sequence of characters

slice notation

the form is my_str[start:end] and it creates a new string whose value contains the characters of my_str from indices start to end

stride

determines how much to increment the index after reading each element

field width

defines the minimum number of characters that must be inserted into the string

alignment character

determines how a value should be aligned within the width of the field

fill character

used to pad a replacement field when the inserted string is smaller than the field width

precision

indicates how many digits should be included in the output of floating types

replace(old, new)

returns a copy of the string with all occurrences of the substring old replaced by the string new; old and new arguments may be string variables/literals

replace(old, new, count)

same as replace(old, new), but it only replaces the first count occurrences of old

find(x)

returns the index of the first occurrence of item x in string or returns -1; x may be a string variable/literal

find(x, start)

same as find(x), but it begins the search at index start

find(x, start, end)

same as find(x, start), but stops the search at index at end -1

rfind(x)

same as find(x), but it searches the string in reverse, returning the last occurrence in the string

count(x)

returns the number of times x occurs in the string

ASCII table

provides a quick lookup of ASCII values

isalnum()

returns True if all characters in string are lowercase/uppercase letters or the numbers 0-9

isdigit()

return True if all characters are the numbers 0-9

islower()

returns True if all cased characters are lowercase letters

isupper()

returns True if all cased characters are uppercase letters

isspace()

returns True if all characters are whitespace

startswith(x)

returns True if the string starts with x

endswith(x)

returns True if the string ends with x

capitalize()

returns a copy of the string with the first character capitalized and the rest lowercased

lower()

returns a copy of the string with all characters lowercased

upper()

returns a copy of the string with all characters uppercased

strip()

returns a copy of the string with leading and trailing whitespace removed

title()

returns a copy of the string as a title, with first letters of words capitalized

split()

splits a string into a list of tokens

token

a substring that forms a part of a larger string

separator

a character/sequence of characters that indicates where to split the string into tokens

join()

joins a list of strings together to create a single string