Lecture 4 python string (ewurc)

Python
Lecture 4
Problem Set 4: String

Topic
• Membership Operator
• String Constants
• String Boolean Methods
• String Methods
• Problem Set 4: String (11)

Membership Operator
• in
• not in

Character input/ output and ASCII value
char = input()
print(char)
char = input()
print(char)
print(ord(char))
char = 'A'
print(ord(char))
char = input()
print(char, " = ", ord(char))

Character input/ output and ASCII value 2
for c in range(33,48):
print(chr(c), end = ' ')
print()
print()
print()
print()
print()
print()

ASCII
c = '0'
print("Char ASCII")
while c<='9':
print(f'{c:4} {ord(c):3}')
c = chr(ord(c) + 1)

ASCII
c = 'A'
print("Char ASCII")
while c<='Z':
c = chr( ord(c) + 1)
c = 'a'
print("Char ASCII")
while c<='z':
c = chr( ord(c) + 1)

String constants
• string.ascii_lowercase
• abcdefghijklmnopqrstuvwxyz
• string.ascii_uppercase
• ABCDEFGHIJKLMNOPQRSTUVWXYZ
• string.ascii_letters
• ascii_lowercase, ascii_uppercase

String constants
• string.digits
• 0123456789
• string.hexdigits
• 0123456789abcdefABCDEF
• string.octdigits
• 01234567

String constants
• string.punctuation
• ! " # $ % & ' ( ) * + , - . / : ; < = > ? @ [ ] ^ _ ` { | } ~
• string.whitespace
• space, tab, linefeed, return, formfeed, vertical tab
• string.printable
• String of ASCII characters which are considered printable. This is a
combination of digits, ascii_letters, punctuation, and whitespace.

String constants
import string
for c in string.ascii_lowercase:
print(c,end=' ')

String constants 1
import string
char = 'A'
if char in string.ascii_letters:
print("Alphabet")
else:
print("Not")
char = '5'
if char in string.digits:
print("Digit")
else:
print("Not")
char = '?'
if char not in string.ascii_letters and char
not in string.digits :
print("Special")
else:
print("Not")

String constants 2
char = 'A'
if char in string.ascii_uppercase:
print("Upper Case")
else:
print("Not")
char = 'a'
if char in string.ascii_lowercase:
print("Lower Case")
else:
print("Not")
vowel = 'aeiouAEIOU'
char = 'A'
if char in vowel:
print("Vowel")
else:
print("Not")
char = 'R'
if char not in vowel:
print("Consonant")
else:
print("Not")

String Matching
str1 = "EWU"
str2 = "EWU"
if str1 == str2:
print("Matched")
else:
print("Not Matched")
str1 = "EWU"
str2 = "ewu"
if str1 == str2:
print("Matched")
else:
print("Not Matched")

String Reverse
str = "EWU"
print(str[::-1])
str1 = "EWU"
str2 = str1[::-1]
print(str2)

String Methods
• https://docs.python.org/3.6/library/stdtypes.html#string-methods
• str.capitalize()
• Return a copy of the string with its first character capitalized and the rest lowercased.
• str.count(sub[, start[, end]])
• Return the number of non-overlapping occurrences of substring sub in the range
[start, end]. Optional arguments start and end are interpreted as in slice notation.
• str.find(sub[, start[, end]])
• Return the lowest index in the string where substring sub is found within the slice
s[start:end]. Optional arguments start and end are interpreted as in slice notation.
Return -1 if sub is not found.
• str.replace(old, new[, count])

String Methods
• string.upper()
• string.lower()

String Boolean Methods
• str.isalnum()
• String consists of only alphanumeric characters (no symbols)
• str.isalpha()
• String consists of only alphabetic characters (no symbols)
• str.isdecimal()
• String consists of only decimal characters
• str.isspace()
• String consists of only whitespace characters

String Boolean Methods
• str.islower()
• String’s alphabetic characters are all lower case
• str.isupper()
• String’s alphabetic characters are all upper case
• string.istitle()
• String is in title case

String Function
• ord(char)
• chr(num)

Problem Set 4: String (11)
• Character input/ output and ASCII value.
• Check is a Character Alphabet/ Digit/ Special Character.
• Check is an Alphabet Vowel or Consonant.
• Check is an Alphabet Upper or Lower Case.
• Input/ Output String and count number of character (String Length count).
• Count Upper and Lower Case in a sentence.
• Change Case (Upper Case to Lower Case).
• String Matching
• String Reverse
• Palindrome
• Word Sorting (Dictionary)

Prepared by
Mun Al Mamun
President
East West University Robotics Club
munewu@gmail.com
T h i s s l i d e i s p r o v i d e a s a c o u r s e
m a t e r i a l i n t h e w o r k s h o p
“ W o r k s h o p O n P y t h o n P r o g r a m m i n g ”
O r g a n i z e d b y
E a s t W e s t U n i v e r s i t y R o b o t i c s C l u b

Lecture 4 python string (ewurc)

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