List and string methods

List and string methods

By Akniyet Sarsenbek

Learning objectives

11.2.2.3apply functions and string processing methods;

11.2.3.3apply functions and methods of processing lists;

11.4.3.2 solve applied problems of various subject areas;​

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Multiple Choice

String revision QUIZ

Use the len method to print the length of the string.

x = "Hello World"

• len.x

• print(len(x))

• x.len()

• print(len)

Multiple Choice

Get the first character of the string txt.

txt = "Hello World"

x =

• txt(1)

• txt(0)

• txt[0]

• txt[1]

Multiple Choice

Get the characters from index 2 to index 4 (llo).

txt = "Hello World"

x =

• txt[2 : 5]

• txt[2 : 4]

• txt[2 : 6]

• txt[1 : 5]

Multiple Choice

What does the following Python Program print out?

• Hello

  there

• 0

• Hellothere

• Hello

Multiple Choice

What does the following Python program print out?

• x2

• int402

• 402

• 42

Multiple Choice

How would you use the index operator [] to print out the letter q from the following string?

x = 'From [e-mail]'

• print(x[q])

• print(x[8])

• print(x[9])

• print(x[7])

Multiple Choice

How would you use string slicing [:] to print out 'uct' from the following string?

x = 'From [e-mail]'

• print(x[14:3])

• print(x[14:17])

• print(x[15:18])

• print(x[14/17])

Multiple Choice

What does the following Python code print out?

• banana7

• 42

• -1

• banana banana banana banana banana banana banana

String methods

count() method

Return the number of times the value "apple" appears in the string:

txt = "I love apples, apple are my favorite fruit"

x = txt.count("apple")

print(x)​

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find() method​

The find() method finds the first occurrence of the specified value.

The find() method returns -1 if the value is not found.​

txt = "Hello, welcome to my world."

x = txt.find("welcome")

print(x)​

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index() method

The index() method finds the first occurrence of the specified value.

The index() method raises an exception if the value is not found.

The index() method is almost the same as the find() method, the only difference is that the find() method returns -1 if the value is not found.​

​txt = "Hello, welcome to my world."

x = txt.index("welcome")

print(x)

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replace() method

The replace() method replaces a specified phrase with another specified phrase.

txt = "I like bananas"

x = txt.replace("bananas", "apples")

print(x)​

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split() method

The split() method splits a string into a list.

You can specify the separator, default separator is any whitespace.

txt = "welcome to the jungle"

x = txt.split()

print(x)​

​

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upper() method

The upper() method returns a string where all characters are in upper case.

 Symbols and Numbers are ignored.

txt = "Hello my friends"

x = txt.upper()

print(x)​

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lower() method

The lower() method returns a string where all characters are lower case.

 Symbols and Numbers are ignored.

txt = "Hello my FRIENDS"

x = txt.lower()

print(x)​

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format() method

The format() method formats the specified value(s) and insert them inside the string's placeholder. The placeholder is defined using curly brackets: {}.The format() method returns the formatted string.

txt = "For only {price} dollars!"

print(txt.format(price = 49))​

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strip() method

The strip() method removes any leading (spaces at the beginning) and trailing (spaces at the end) characters (space is the default leading character to remove)

txt = "     banana     "

x = txt.strip()

print("of all fruits", x, "is my favorite")​

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There are a lot of other string methods. Other methods are listed in the link below.

https://www.w3schools.com/python/python_strings_methods.asp

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Multiple Choice

Which of the following is not a valid string method in Python?

• upper()

• lower()

• middle()

• strip()

Solve string problems

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