Extended Slicing and String Methods

 Extended Slicing

Syntax:

variable[start_index:end_index:step]

Step determines the increment between each index for slicing.

Code

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a = "Waterfall"

part = a[1:6:3]

print(part)

PYTHON

Output

ar

Methods

Python has a set of built-in reusable utilities. They simplify the most commonly performed operations are:

String Methods

• isdigit()
• strip()
• lower()
• upper()
• startswith()
• endswith()
• replace()
   and more...

Isdigit

Syntax:

str_var.isdigit()

Gives

True

if all the characters are digits. Otherwise,

False

Code

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is_digit = "4748".isdigit()

print(is_digit)

PYTHON

Output

True

Strip

Syntax:

str_var.strip()

Removes all the leading and trailing spaces from a string.

Code

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mobile = " 9876543210 "

mobile = mobile.strip()

print(mobile)

PYTHON

Output

9876543210

Strip - Specific characters

Syntax:

str_var.strip(chars)

We can also specify characters that need to be removed.

Code

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name = "Ravi."

name = name.strip(".")

print(name)

PYTHON

Output

Ravi

Strip - Multiple Characters

Removes all spaces, comma(,) and full stop(.) that lead or trail the string.

Code

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name = ", .. ,, ravi ,, .. ."

name = name.strip(" ,.")

print(name)

PYTHON

Output

ravi

Replace

Syntax:

str_var.replace(old,new)

Gives a new string after replacing all the occurrences of the old substring with the new substring.

Code

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sentence = "teh cat and teh dog"

sentence = sentence.replace("teh","the")

print(sentence)

PYTHON

Output

the cat and the dog

Startswith

Syntax:

str_var.startswith(value)

Gives

True

if the string starts with the specified value. Otherwise,

False

Code

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url = "https://onthegomodel.com"

is_secure_url = url.startswith("https://")

print(is_secure_url)

PYTHON

Output

True

Endswith

Syntax:

str_var.endswith(value)

Gives

True

if the string ends with the specified value. Otherwise,

False

Code

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gmail_id = "rahul123@gmail.com"

is_gmail = gmail_id.endswith("@gmail.com")

print(is_gmail)

PYTHON

Output

True

Upper

Syntax:

str_var.upper()

Gives a new string by converting each character of the given string to uppercase.

Code

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name = "ravi"

print(name.upper())

PYTHON

Output

RAVI

Lower

Syntax:

str_var.lower()

Gives a new string by converting each character of the given string to lowercase.

Code

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name = "RAVI"

print(name.lower())

PYTHON

Output

ravi