Python String | String Data Type | Raw String in Python | New line in Python | \n in Python |
In Python, a string is a sequence of characters enclosed within either single ('') or double ("") quotation marks. Strings are a fundamental data type and are used to represent textual data. They can contain letters, numbers, symbols, and even spaces.
Here's a brief explanation of some key features and operations related to strings in Python:
Creating Strings:
You can create strings using single or double quotes. For example:
single_quoted = 'Hello, devvrat!'
double_quoted = "Knowledgevilla is great channel"
String Concatenation:
You can combine strings using the + operator. For example:
greeting = "Hello"
name = "Devvrat"
full_greeting = greeting + ", " + name
String Indexing:
Each character in a string has a unique index, starting from 0 for the first character. You can access individual characters using indexing. For example:
message = "Python"
first_char = message[0] # 'P'
second_char = message[1] # 'y'
String Slicing:
You can extract a portion of a string using slicing. Slicing is done using the format [start:end], where start is the index of the first character you want and end is the index of the character just after the last character you want. For example:
phrase = "Python Programming"
substring = phrase[7:15] # "Programming"
String Methods:
Python provides various built-in methods for working with strings. Some common methods include:
len(): Returns the length of the string.
lower(): Converts the string to lowercase.
upper(): Converts the string to uppercase.
strip(): Removes leading and trailing whitespace.
split(): Splits the string into a list of substrings based on a delimiter.
replace(): Replaces a specified substring with another substring.
And many more...
String Formatting:
You can format strings using various techniques, such as:
F-strings (formatted string literals)
str.format() method
% operator
String Escape Characters:
Escape characters are used to represent characters that can't be directly inserted into a string. For example, \n represents a newline character, and \" represents a double quote within a double-quoted string.
Raw Strings:
Raw strings are used to ignore escape characters. They are defined by prefixing the string with an 'r' or 'R'. For example: r"C:\path\to\file"
Strings are immutable in Python, which means you can't modify a string in place. Instead, you create new strings when performing operations like concatenation or replacement.
Here are a few examples using the string "devvrat knowledgevilla":
String Length:
string = "devvrat knowledgevilla"
length = len(string) # 22
Uppercase and Lowercase:
string = "devvrat knowledgevilla"
uppercase = string.upper() # "DEVVRAT KNOWLEDGEVILLA"
lowercase = string.lower() # "devvrat knowledgevilla"
String Splitting:
string = "devvrat knowledgevilla"
words = string.split() # ['devvrat', 'knowledgevilla']
String Indexing:
string = "devvrat knowledgevilla"
first_char = string[0] # 'd'
third_char = string[2] # 'v'
String Slicing:
string = "devvrat knowledgevilla"
substring = string[8:19] # "knowledgevilla"
String Concatenation:
greeting = "Hello"
name = "Devvrat"
message = greeting + ", " + name # "Hello, Devvrat"
String Replacement:
string = "devvrat knowledgevilla"
new_string = string.replace("knowledge", "information") # "devvrat informationvilla"
Finding Substring:
string = "devvrat knowledgevilla"
index = string.find("knowledge") # 8
String Formatting (F-strings):
name = "Devvrat"
age = 25
formatted_string = f"My name is {name} and I am {age} years old."
"My name is Devvrat and I am 25 years old."
String with Escape Characters:
message = "This is a \"quote\" within a string."
#str.capitalize()
name = "devvrat knowledgevilla"
capitalized_name = name.capitalize()
print(capitalized_name)
#str.casefold()
name = "Devvrat Knowledgevilla"
casefolded_name = name.casefold()
print(casefolded_name)
#str.center(width[, fillchar])
name = "devvrat knowledgevilla"
centered_name = name.center(50, '*')
print(centered_name)
#str.count(sub[, start[, end]])
name = "devvrat knowledgevilla"
substring = "knowledge"
count = name.count(substring)
print(f"The substring '{substring}' appears {count} times in the string.")
#str.encode(encoding='utf-16', errors='strict')
name = "devvrat knowledgevilla"
encoded_name = name.encode(encoding='utf-16')
print(encoded_name)
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