Learning Python-Basic course: Day 22, String Methods Part-1

#Interpreting the string as an array of characters.txt= "Python"print(txt)print("Length of the txt = ", len(txt))#display string using in keywordfor ch in txt:    print(ch)#display the string in original form using range()for ch in range(0, len(txt)):    print(txt[ch], end=" ")print()#to display in reverse orderfor ch in range(len(txt)-1, -1 , -1):    print(txt[ch], end="")#We cannot append a character or pop using the standered length functions.txt.append("a")print(txt)

PythonLength of the txt =  6PythonP y t h o n nohtyPTraceback (most recent call last):  File "C:/Users/aatma/Downloads/Example 1 .py", line 21, in <module>    txt.append("a")AttributeError: 'str' object has no attribute 'append'

#1. Upper case the first letter in this sentence:txt = "hello, AND Welcome"x = txt.capitalize()print (x)#output : Hello, and welcome#2. Make the string lower case:txt = "Hello, And Welcome!@#$"x = txt.lower()print (x)#output : hello, and welcome#3. Make the string upper case:txt = "Hello, And Welcome"x = txt.upper()print (x)#output : HELLO, AND WELCOME

Hello, and welcomehello, and welcome!@#$HELLO, AND WELCOME

#1.Print the word "computer", taking up the space of 25 characters,#with "computer" in the middle:txt = "computer"x = txt.center(25)  print ("hello",x,"world")# 2 default spaces+25 total characters. so distance between hello and world must be 27 characters.#2. Return the number of times the value "act" appears in the string:txt = "I love programming, programming is my favorite activity"print(txt)x = txt.count('i') print ("Frequency of the value =" , x)#case matters. Capital I and small i are treated differently.#3. Check if the string ends with a punctuation sign .txt = "Hello, welcome to my world."x = txt.endswith("my world.")print(x)#4. Set the tab size to 5 whitespaces:print("Firstsecond")txt1 = "ACADEMY"              txt = "ACADEM Y" # backslah t (i.e. ) represents tab space. x =  txt.expandtabs(6) #expands the tab spacesprint(x)#5. Locates the word "welcome" in the string and returns the index:txt = "Hello, welcome to my world."print(txt)x = txt.find("welcome")print(x)#output : 7#if the result is -1, string does not exist in the sentence

hello          computer         worldI love programming, programming is my favorite activityFrequency of the value = 6TrueFirst   secondA     C     A     DE    M YHello, welcome to my world.7

Please enter a string: a QUick Brown FOX jumps OVer the Lazy doGA quick brown fox jumps over the lazy dog.

Please enter a string: PythonP P y P y t P y t h P y t h o P y t h o n