21 String Methods in Python: Very Important Methods for Empowering Code

# Input string
text = "python programming is fun"

# Apply the capitalize() method
capitalized_text = text.capitalize()

# Output the original and capitalized strings
print("Original String:", text)
print("Capitalized String:", capitalized_text)


Output:

Original String: python programming is fun

Capitalized String: Python programming is fun

# Input string
text = "ThIs Is A CaSeFoLd ExAmPlE."

# Apply the casefold() method
casefolded_text = text.casefold()

# Output the original and casefolded strings
print("Original String:", text)
print("Casefolded String:", casefolded_text)


Output:

Original String: ThIs Is A CaSeFoLd ExAmPlE.

Casefolded String: this is a casefold example.

# Input string
text = "Codejunctionpro"

# Apply the center() method to center-align the string in a width of 12 characters, using '-' as padding
centered_text = text.center(12, '-')

# Output the centered string
print(centered_text)


Output:

Codejunctionpro

# Input string
text = "Python is an easy-to-learn programming language. Python is versatile and Python is fun."

# Count the number of occurrences of the word "Python" in the string
count = text.count("Python")

# Output the result
print("The word 'Python' appears", count, "times in the text.")

Output:

The word 'Python' appears 3 times in the text.

# Input string
text = "Hello, World"

# Check if the string ends with "World"
result1 = text.endswith("World")

# Check if the string ends with "Hello"
result2 = text.endswith("Hello")

# Output the results
print(f'Does the string end with "World"? {result1}')
print(f'Does the string end with "Hello"? {result2}')

Output:

Does the string end with "World"? True

Does the string end with "Hello"? False

# Input string with tab characters
text = "Python\tis\tawesome"

# Use the expandtabs() method to replace tabs with spaces
expanded_text = text.expandtabs(4)

# Output the expanded string
print("Original String:")
print(text)
print("\nExpanded String:")
print(expanded_text)

Output:

Original String:
Python	is	awesome

Expanded String:
Python  is  awesome

# Input string
text = "Python is a powerful programming language. Python is versatile and Python is fun."

# Find the first occurrence of "Python" in the string
index = text.find("Python")

# Output the result
if index != -1:
    print(f"'Python' found at index {index}")
else:
    print("'Python' not found in the string.")

Output:

'Python' found at index 0

# Define variables
name = "John"
age = 30

# Create a formatted string using the format() method
formatted_string = "My name is {} and I am {} years old.".format(name, age)

# Output the formatted string
print(formatted_string)

Output:

My name is John and I am 30 years old.

# Input string
text = "Python is a versatile programming language. Python is fun."

try:
    # Find the index of the first occurrence of "Python" in the string
    index = text.index("Python")
    print("'Python' found at index", index)
except ValueError:
    print("'Python' not found in the string.")

Output:

'Python' found at index 0

# Input strings
string1 = "Python3"
string2 = "Python 3"
string3 = "12345"

# Check if the strings are alphanumeric
result1 = string1.isalnum()
result2 = string2.isalnum()
result3 = string3.isalnum()

# Output the results
print(f'Is "{string1}" alphanumeric? {result1}')
print(f'Is "{string2}" alphanumeric? {result2}')
print(f'Is "{string3}" alphanumeric? {result3}')

Output:

Is "Python3" alphanumeric? True
Is "Python 3" alphanumeric? False
Is "12345" alphanumeric? True

# Input strings
string1 = "Python"
string2 = "Python3"
string3 = "12345"

# Check if the strings are alphabetic
result1 = string1.isalpha()
result2 = string2.isalpha()
result3 = string3.isalpha()

# Output the results
print(f'Is "{string1}" alphabetic? {result1}')
print(f'Is "{string2}" alphabetic? {result2}')
print(f'Is "{string3}" alphabetic? {result3}')

Output:

Is "Python" alphabetic? True
Is "Python3" alphabetic? False
Is "12345" alphabetic? False

# Input strings
string1 = "12345"
string2 = "123.45"
string3 = "Python"

# Check if the strings are composed of decimal digits
result1 = string1.isdecimal()
result2 = string2.isdecimal()
result3 = string3.isdecimal()

# Output the results
print(f'Is "{string1}" composed of decimal digits? {result1}')
print(f'Is "{string2}" composed of decimal digits? {result2}')
print(f'Is "{string3}" composed of decimal digits? {result3}')

Output:

Is "12345" composed of decimal digits? True
Is "123.45" composed of decimal digits? False
Is "Python" composed of decimal digits? False

# Input strings
string1 = "12345"
string2 = "123.45"
string3 = "Python"

# Check if the strings consist of digits
result1 = string1.isdigit()
result2 = string2.isdigit()
result3 = string3.isdigit()

# Output the results
print(f'Is "{string1}" composed of digits? {result1}')
print(f'Is "{string2}" composed of digits? {result2}')
print(f'Is "{string3}" composed of digits? {result3}')

Output:

Is "12345" composed of digits? True
Is "123.45" composed of digits? False
Is "Python" composed of digits? False

# Input strings
string1 = "my_variable"
string2 = "123variable"
string3 = "for"
string4 = "my-variable"

# Check if the strings are valid Python identifiers
result1 = string1.isidentifier()
result2 = string2.isidentifier()
result3 = string3.isidentifier()
result4 = string4.isidentifier()

# Output the results
print(f'Is "{string1}" a valid Python identifier? {result1}')
print(f'Is "{string2}" a valid Python identifier? {result2}')
print(f'Is "{string3}" a valid Python identifier? {result3}')
print(f'Is "{string4}" a valid Python identifier? {result4}')

Output:

Is "my_variable" a valid Python identifier? True
Is "123variable" a valid Python identifier? False
Is "for" a valid Python identifier? True
Is "my-variable" a valid Python identifier? False

# Input strings
string1 = "hello world"
string2 = "Hello World"
string3 = "pythoniscool"

# Check if the strings are in lowercase
result1 = string1.islower()
result2 = string2.islower()
result3 = string3.islower()

# Output the results
print(f'Is "{string1}" in lowercase? {result1}')
print(f'Is "{string2}" in lowercase? {result2}')
print(f'Is "{string3}" in lowercase? {result3}')


Output:

Is "hello world" in lowercase? True
Is "Hello World" in lowercase? False
Is "pythoniscool" in lowercase? True

# Input strings
string1 = "12345"
string2 = "½"
string3 = "3.14"
string4 = "Python"

# Check if the strings are numeric
result1 = string1.isnumeric()
result2 = string2.isnumeric()
result3 = string3.isnumeric()
result4 = string4.isnumeric()

# Output the results
print(f'Is "{string1}" numeric? {result1}')
print(f'Is "{string2}" numeric? {result2}')
print(f'Is "{string3}" numeric? {result3}')
print(f'Is "{string4}" numeric? {result4}')

Output:

Is "12345" numeric? True
Is "½" numeric? True
Is "3.14" numeric? False
Is "Python" numeric? False

# Input strings
string1 = "Hello, World!"
string2 = "Line 1\nLine 2"
string3 = "Python is fun."

# Check if the strings are printable
result1 = string1.isprintable()
result2 = string2.isprintable()
result3 = string3.isprintable()

# Output the results
print(f'Is "{string1}" printable? {result1}')
print(f'Is "{string2}" printable? {result2}')
print(f'Is "{string3}" printable? {result3}')

Output:

Is "Hello, World!" printable? True
Is "Line 1
Line 2" printable? False
Is "Python is fun." printable? True

# Input strings
string1 = "    "  # Contains only spaces
string2 = "Hello World"  # Contains letters and spaces
string3 = "\t\t"  # Contains only tabs
string4 = "  \t\n"  # Contains spaces, tabs, and newlines

# Check if the strings consist of whitespace characters
result1 = string1.isspace()
result2 = string2.isspace()
result3 = string3.isspace()
result4 = string4.isspace()

# Output the results
print(f'Is "{string1}" composed of whitespace characters? {result1}')
print(f'Is "{string2}" composed of whitespace characters? {result2}')
print(f'Is "{string3}" composed of whitespace characters? {result3}')
print(f'Is "{string4}" composed of whitespace characters? {result4}')

Output:

Is "    " composed of whitespace characters? True
Is "Hello World" composed of whitespace characters? False
Is "		" composed of whitespace characters? True
Is "  	
" composed of whitespace characters? True

# Input strings
string1 = "This Is a Title"
string2 = "This is Not a Title"
string3 = "title Case"
string4 = "title case"

# Check if the strings are in title case
result1 = string1.istitle()
result2 = string2.istitle()
result3 = string3.istitle()
result4 = string4.istitle()

# Output the results
print(f'Is "{string1}" in title case? {result1}')
print(f'Is "{string2}" in title case? {result2}')
print(f'Is "{string3}" in title case? {result3}')
print(f'Is "{string4}" in title case? {result4}')

Output:

Is "This Is a Title" in title case? False
Is "This is Not a Title" in title case? False
Is "title Case" in title case? False
Is "title case" in title case? False

# Input strings
string1 = "HELLO WORLD"
string2 = "Hello World"
string3 = "PYTHONISCOOL"

# Check if the strings are in uppercase
result1 = string1.isupper()
result2 = string2.isupper()
result3 = string3.isupper()

# Output the results
print(f'Is "{string1}" in uppercase? {result1}')
print(f'Is "{string2}" in uppercase? {result2}')
print(f'Is "{string3}" in uppercase? {result3}')

Output:

Is "HELLO WORLD" in uppercase? True
Is "Hello World" in uppercase? False
Is "PYTHONISCOOL" in uppercase? True

# List of strings
words = ["Hello", "World", "Python", "Programming"]

# Define a delimiter
delimiter = ", "

# Use the join() method to concatenate the list of strings
result = delimiter.join(words)

# Output the result
print(result)


Output:

Hello, World, Python, Programming