String Manipulation

Practicing operations and methods for manipulating strings.

1

How do you find the length of a string?

text = "Hello, World!"
length = len(text)
print(length)  # Output: 13

---

2

How do you convert a string to uppercase?

text = "hello"
upper_text = text.upper()
print(upper_text)  # Output: HELLO

---

3

How do you convert a string to lowercase?

text = "HELLO"
lower_text = text.lower()
print(lower_text)  # Output: hello

---

4

How do you capitalize the first letter of a string?

text = "hello"
capitalized_text = text.capitalize()
print(capitalized_text)  # Output: Hello

---

5

How do you split a string into a list?

text = "apple,banana,cherry"
split_text = text.split(",")
print(split_text)  # Output: ['apple', 'banana', 'cherry']

---

6

How do you join a list of strings into a single string?

words = ["apple", "banana", "cherry"]
joined_text = ", ".join(words)
print(joined_text)  # Output: apple, banana, cherry

---

7

How do you check if a string contains a substring?

text = "Hello, World!"
contains_hello = "Hello" in text
print(contains_hello)  # Output: True

---

8

How do you find the index of a substring in a string?

text = "Hello, World!"
index = text.find("World")
print(index)  # Output: 7

---

9

How do you replace a substring with another substring?

text = "Hello, World!"
replaced_text = text.replace("World", "Python")
print(replaced_text)  # Output: Hello, Python!

---

10

How do you remove leading and trailing whitespace from a string?

text = "   Hello, World!   "
stripped_text = text.strip()
print(stripped_text)  # Output: Hello, World!

---

11

How do you check if a string starts with a specific substring?

text = "Hello, World!"
starts_with_hello = text.startswith("Hello")
print(starts_with_hello)  # Output: True

---

12

How do you check if a string ends with a specific substring?

text = "Hello, World!"
ends_with_world = text.endswith("World!")
print(ends_with_world)  # Output: True

---

13

How do you remove all instances of a substring from a string?

text = "Hello, World! World!"
no_world_text = text.replace("World", "")
print(no_world_text)  # Output: Hello, ! !

---

14

How do you count the number of occurrences of a substring in a string?

text = "Hello, World! World!"
count = text.count("World")
print(count)  # Output: 2

---

15

How do you convert a string into a list of characters?

text = "hello"
char_list = list(text)
print(char_list)  # Output: ['h', 'e', 'l', 'l', 'o']

---

16

How do you find all occurrences of a substring and their positions?

import re
text = "Hello, World! World!"
matches = [m.start() for m in re.finditer("World", text)]
print(matches)  # Output: [7, 14]

---

17

How do you pad a string with leading characters?

text = "42"
padded_text = text.zfill(5)
print(padded_text)  # Output: 00042

---

18

How do you align a string to the center with padding?

text = "hello"
centered_text = text.center(10, "*")
print(centered_text)  # Output: ***hello***

---

19

How do you strip only leading whitespace from a string?

text = "   Hello, World!"
lstripped_text = text.lstrip()
print(lstripped_text)  # Output: Hello, World!

---

20

How do you strip only trailing whitespace from a string?

text = "Hello, World!   "
rstripped_text = text.rstrip()
print(rstripped_text)  # Output: Hello, World!

---

21

How do you reverse a string?

text = "hello"
reversed_text = text[::-1]
print(reversed_text)  # Output: olleh

---

22

How do you repeat a string multiple times?

text = "hello"
repeated_text = text * 3
print(repeated_text)  # Output: hellohellohello

---

23

How do you convert a string to a list of words?

text = "This is a test"
word_list = text.split()
print(word_list)  # Output: ['This', 'is', 'a', 'test']

---

24

How do you check if a string is numeric?

text = "1234"
is_numeric = text.isdigit()
print(is_numeric)  # Output: True

---

25

How do you check if all characters in a string are alphanumeric?

text = "hello123"
is_alphanumeric = text.isalnum()
print(is_alphanumeric)  # Output: True

---