Hello students Here we come with new topic String. String is the collection of character and collection of words. like A word and A sentence or may be a paragraph. Here we define some important string function which is used on String and all this function always return a new value not change original value. We define some string methods and its definition.
Read all these method and See output of each programme and each method
| Method | Description |
|---|---|
| capitalize() | Converts the first character to upper case |
| casefold() | Converts string into lower case |
| center() | Returns a centered string |
| count() | Returns the number of times a specified value occurs in a string |
| encode() | Returns an encoded version of the string |
| endswith() | Returns true if the string ends with the specified value |
| expandtabs() | Sets the tab size of the string |
| find() | Searches the string for a specified value and returns the position of where it was found |
| format() | Formats specified values in a string |
| format_map() | Formats specified values in a string |
| index() | Searches the string for a specified value and returns the position of where it was found |
| isalnum() | Returns True if all characters in the string are alphanumeric |
| isalpha() | Returns True if all characters in the string are in the alphabet |
| isascii() | Returns True if all characters in the string are ascii characters |
| isdecimal() | Returns True if all characters in the string are decimals |
| isdigit() | Returns True if all characters in the string are digits |
| isidentifier() | Returns True if the string is an identifier |
| islower() | Returns True if all characters in the string are lower case |
| isnumeric() | Returns True if all characters in the string are numeric |
| isprintable() | Returns True if all characters in the string are printable |
| isspace() | Returns True if all characters in the string are whitespaces |
| istitle() | Returns True if the string follows the rules of a title |
| isupper() | Returns True if all characters in the string are upper case |
| join() | Converts the elements of an iterable into a string |
| ljust() | Returns a left justified version of the string |
| lower() | Converts a string into lower case |
| lstrip() | Returns a left trim version of the string |
| maketrans() | Returns a translation table to be used in translations |
| partition() | Returns a tuple where the string is parted into three parts |
| replace() | Returns a string where a specified value is replaced with a specified value |
| rfind() | Searches the string for a specified value and returns the last position of where it was found |
| rindex() | Searches the string for a specified value and returns the last position of where it was found |
| rjust() | Returns a right justified version of the string |
| rpartition() | Returns a tuple where the string is parted into three parts |
| rsplit() | Splits the string at the specified separator, and returns a list |
| rstrip() | Returns a right trim version of the string |
| split() | Splits the string at the specified separator, and returns a list |
| splitlines() | Splits the string at line breaks and returns a list |
| startswith() | Returns true if the string starts with the specified value |
| strip() | Returns a trimmed version of the string |
| swapcase() | Swaps cases, lower case becomes upper case and vice versa |
| title() | Converts the first character of each word to upper case |
| translate() | Returns a translated string |
| upper() | Converts a string into upper case |
| zfill() | Fills the string with a specified number of 0 values at the beginning |
You can use three double quotes:
a = """Lorem ipsum dolor sit amet,
consectetur adipiscing elit,
sed do eiusmod tempor incididunt
ut labore et dolore magna aliqua."""
print(a)
a = '''Lorem ipsum dolor sit amet,
sed do eiusmod tempor incididunt
ut labore et dolore magna aliqua.'
consectetur adipiscing elit,
sed do eiusmod tempor incididunt
ut labore et dolore magna aliqua.'''
print(a)
a = "Hello, World!"
print(a[1])
a = "Hello, World!"
print(len(a))
txt = "The best things in life are free!"
print("free" in txt)
txt = "The best things in life are free!"
print("expensive" not in txt)
txt = "The best things in life are free!"
if "expensive" not in txt:
print("No, 'expensive' is NOT present.")
Get the characters from position 2 to position 5 (not included):
b = "Hello, World!"
print(b[2:5])
Get the characters from the start to position 5 (not included):
b = "Hello, World!"
print(b[:5])
Get the characters from position 2, and all the way to the end:
b = "Hello, World!"
print(b[2:])
a = "Hello, World!"
print(a.upper())
a = "Hello, World!"
print(a.lower())
a = " Hello, World! "
print(a.strip()) # returns "Hello, World!"
a = "Hello, World!"
print(a.replace("H", "J"))
a = "Hello, World!"
print(a.split(",")) # returns ['Hello', ' World!']
a = "Hello"
b = "World"
c = a + b
print(c)
a = "Hello"
b = "World"
c = a + " " + b
print(c)
age = 36
txt = "My name is John, and I am {}"
print(txt.format(age)
quantity = 3
itemno = 567
price = 49.95
myorder = "I want {} pieces of item {} for {} dollars."
print(myorder.format(quantity, itemno, price))
quantity = 3
itemno = 567
price = 49.95
myorder = "I want to pay {2} dollars for {0} pieces of item {1}."
print(myorder.format(quantity, itemno, price))
print(txt = "We are the so-called \"Vikings\" from the north.")
| Code | Result | |
|---|---|---|
| \' | Single Quote | |
| \\ | Backslash | |
| \n | New Line | |
| \r | Carriage Return | |
| \t | Tab | |
| \b | Backspace |
Get the characters:
From: "o" in "World!" (position -5)
To, but not included: "d" in "World!" (position -2):
b = "Hello, World!"
print(b[-5:-2])
a='''consectetur adipiscing elit,
sed do eiusmod tempor incididunt
ut labore et dolore magna aliqua.
consectetur adipiscing elit,
sed do eiusmod tempor incididunt
ut labore et dolore magna aliqua.'''
print(a)
a = "Hello, World!"
print(a[1])
a = "Hello, World!"
print(len(a))
txt = "The best things in life are free!"
print("free" in txt)
txt = "The best things in life are free!"
print("expensive" not in txt)
txt = "The best things in life are free!"
if "expensive" not in txt:
print("No, 'expensive' is NOT present.")
Get the characters from position 2 to position 5 (not included):
b = "Hello, World!"
print(b[2:5])
Get the characters from the start to position 5 (not included):
b = "Hello, World!"
print(b[:5])
Get the characters from position 2, and all the way to the end:
b = "Hello, World!"
print(b[2:])
Get the characters:
From: "o" in "World!" (position -5)
To, but not included: "d" in "World!" (position -2):
b = "Hello, World!"
print(b[-5:-2])
Q1. Write a program to accept a string and display its length.
Ans.
str = input("Enter any String")
print(len(str))
Q2. Write a program to accept a string and count number of vowels.
Ans.
str = input("Enter any String")
s1="aeiouAEIOU"
v=0
for i in str: if i in s1:
v=v+1 print(v)
Q3. Write a program to accept a string and display it in reverse.
Ans
str = input("Enter any String") print(str[: :-1])
Q4. Write a program to check whether an input string is palindrome or not.
Ans.
str = input("Enter any String")
strrev =""
for i in range(len(str),0,-1):
strrev=strrev + str[i-1]
if str.lower() == strrev.lower():
print("Palindrome")
else: print("Not a palindrome")
Q5. Write a program to count number of small case alphabets in String.
Ans.
str = input("Enter any String")
L=0
for i in str:
if i.islower( ):
L = L+1
print("Total small case alphabets are : ",L)
Q6. Write a program to count the number of words in the input string.
Ans.
str = input("Enter any String")
L=str.split()
print("Total number of words are ", len(L))
Q7. Write a program to accept a string from the user and count the frequency of alphabet ‘a’ and ‘c’.
Ans.
str = input("Enter any String")
a=0
c=0
for i in str:
if i=='a':
a+=1
if i=='c':
c+=1
print("Total number of alphabet 'a' is ", a)
print("Total number of alphabet 'c' is ", c)
Q8. Write a program to display the last word of the string accepted from user.
Ans.
str = input("Enter any String")
w=str.split()
print(w[-1])
Q9. Write a program to display those words from the string in python which are starting from alphabet ‘a’ or ‘A”.
Ans.
str = input("Enter any String")
w=str.split()
c=0
for i in w:
if i[0]=='a' or i[0]=='A':
c=c+1
print("Total words starting from 'a' or 'A' : ",c)
Q10. Write a program to count number of digits in a string accepted from user.
Ans.
str = input("Enter any String")
d=0 for i in str:
if i.isdigit():
d=d+1
print("Total digits are : ",d)
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