Python Programming/Variables and Strings/Solutions
1. Write a program that asks the user to type in a string, and then tells the user how long that string was.
We will save the string in question as "
str() command converts the user input into a string. Then we have the program print the length. Note that the print statement doesn't require extra spaces - these are added automatically.
string1 = str(raw_input("Type in a string: ")) print ("The string is", len(string1), "characters long.")
2. Ask the user for a string, and then for a number. Print out that string, that many times. (For example, if the string is
hello and the number is
3 you should print out
Ask the user for some text and use the
str() command to turn it into a string (we will save it as "
text"). Then ask the user for a number and use the
int() command to turn it into an integer. We'll save this as "
text = str(raw_input("Type in some text: ")) number = int(raw_input("How many times should it be printed? ")) print (text * number)
3. What would happen if a mischievous user typed in a word when you ask for a number? Try it.
Let's try it! You can use a simple program such as this one:
number = int(raw_input("Type in a number: ")) doubled = number * 2 print (doubled)
When we run it with text we get an error:
Type in a number: I am not a number! Traceback (most recent call last): File "C:/Documents and Settings/D Irwin/Desktop/test2.py", line 1, in <module> number = int(raw_input("Type in a number: ")) ValueError: invalid literal for int() with base 10: 'I am not a number! '
The program calmly reminds us that
'I am not a number! ' is not a number!