Python Strings | 3/100 Days of Python Algo trading

1. Consider the code: my_string = "Summer 2024". Which of the following expressions would correctly extract the year?

my_string[7:11]

my_string[-4:]

my_string[6:]

my_string(7, 11)

2. What is the output of the following code?
Python
text = "Python Programming"new_text = text.replace("Programming", "Finance")
print(new_text)

Python Programming

Python Finance

Finance Programming

An error occurs

3. What is the purpose of the following code?
Python
ticker = " AAPL "clean_ticker = ticker.strip()

To convert the ticker to lowercase

To remove leading and trailing whitespace

To split the ticker into individual letters

To calculate the length of the ticker

4. Which code correctly checks if a string starts with a specific substring?
Python
message = "Welcome to the course"

message.startswith("Welcome")

message.begin("Welcome")

message.find("Welcome") == 0

All of the above

5. How would you split the string portfolio = "AAPL-MSFT-GOOG" into a list of individual ticker symbols using the hyphen as the separator?

portfolio.split("-")

portfolio.divide("-")

portfolio.slice("-")

portfolio.separate("-")

6. What is the output of the following code?
Python
name = "Jane"age = 30info = f"Name: {name}, Age: {age}"print(info)

Name: Jane, Age: 30

f"Name: {name}, Age: {age}"

{name}, {age}

An error occurs

7. What data type does the .split() method return?

String

List

Tuple

Dictionary

8. How would you convert a list of strings into a single string joined by commas?

join(",", my_list)

",".join(my_list)

my_list.join(",")

combine(",", my_list)

9. Which method would you use to find the first occurrence of the letter "o" in the string text = "coding"?

text.index("o")

text.locate("o")

text.search("o")

text.position("o")

10. What does the isalnum() string method do?

Checks if all characters in the string are letters

Checks if all characters in the string are numbers

Checks if all characters are alphanumeric (letters or numbers)

Checks if the string is empty

11. You have a string price = "$123.45". How would you remove the dollar sign?

price.strip("$")

price.replace("$", "")

price[1:]

price.remove("$")

12. What is the output of the following code?

Python
text = "Coding is fun"result = text[::-1]
print(result)

"Coding is fun"

"nuf si gnidoC"

An error

"fun is Coding"

13. How do you check if a string is entirely lowercase?

string.islower()

string.casefold()

string.lowercheck() )

string.allsmall(

14. What is the difference between string.find() and string.index()?

find() returns -1 if the substring is not found, index() raises an error.

find() finds the last occurrence, index() finds the first.

They are identical methods.

find() is case-sensitive, index() is not.

15. How would you format a floating-point number to two decimal places in a string?

str.format(num, 2f)

f"{num:.2f}"

"{:.2f}".format(num)

b and c

16. What does the isdigit() string method do?

Checks if the string can be converted to an integer

Checks if all characters in the string are numbers

Counts the number of digits in the string

Converts the string to a floating-point number

17. How would you convert the string my_string = "hello world" to title case (first letter of each word capitalized)?

my_string.capitalize()

my_string.toTitle()

my_string.upperCase()

my_string.title()

18. What is the purpose of the rfind() string method?

Finds the first occurrence of a substring

Finds the last occurrence of a substring

Reverses the string

Removes a substring from the string

19. Which method reverses the order of items in a list?

list.sort()

list.reverse()

list.shuffle()

list.reorder()

20. Given the string text = " Hello, world! ", what is the result of text.strip().split(",")?

["Hello", "world!"]

[" Hello", "world! "]

["Hello", " world!"]

An error would occur

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