A Smarter Way to Learn Python - Chapter 65 Exercises

The text in info.txt is "boogie". What text does it contain after the following code executes?

with open("info.text", "a") as f:
f.write("woogie")

"boogiewoogie"

^ *•?boogiewoogie•? *$

Rewrite the following two lines to add the text instead of replacing it.

with open("x.txt", "w") as f:
f.write("Hi")

with open("x.txt", "a") as f:
f.write("Hi")

^ *with open$•x\.txt•, •a•$ as f:\n f\.write$•Hi•$ *$

Open a file, "products.txt", to append. The file handle is prod_file

with open("products.txt", "a") as prod_file:

with `open`(`"products.txt"`, `"`a`"`) `as `prod_file`:

Code the next line. The string to append is a new line followed by "Hi". Start by indenting.

with open("greetings.txt", "a") as f:

f.write("\nHi")

Assign a string to a variable. Begin the string with a new line. Make up everything else.

new_string = "\nHello, World!"

^ *[a-zA-Z_][a-zA-Z0-9_]* = •\\n.+• *$

Assign the name of a text file to a variable. Then open the file to append to it. Make everything up.

file_to_open = "students.txt"
with open(file_to_open, "a") as f:

^ *([a-zA-Z_][a-zA-Z0-9_]*) = •[a-zA-Z_][a-zA-Z0-9_]*\.txt•\nwith open$\1, •a•$ as [a-zA-Z_][a-zA-Z0-9_]*: *$

When the contents of the file greet.txt are displayed, here's what is displayed:
Hello.
Have a nice day.
Write the string to the file. Make up the file handle.

with open("greet.txt", "w") as f:
f.write("Hello.\nHave a nice day.")

^ *with open$•greet\.txt•, •w•$ as ([a-zA-Z_][a-zA-Z0-9_]*):\n \1\.write$•Hello\.\\nHave a nice day\.•$ *$

In two lines, open a text file and display its contents. Use shorthand. Make everything up.

with open("tiny.txt") as f:
print(f.read())

^ *with open$•.+\.txt•$ as ([a-zA-Z_][a-zA-Z0-9_]*):\n print$\1\.read\($\) *$

Assign a string to a variable. Then append the string to a text file. Make everything up.

text_to_add = "Hello, World!"
with open("hi.txt", "a") as f:
f.write(text_to_add)

^ *([a-zA-Z_][a-zA-Z0-9_]*) = •.+•\nwith open$•.+\.txt•, •a•$ as ([a-zA-Z_][a-zA-Z0-9_]*):\n \2\.write$\1$ *$

Write some text to a text file. Then append some more text to that file. Make everything up.

with open("brief_encounter.txt", "w") as f:
f.write("Hello.")
with open("brief_encounter.txt", "a") as f:
f.write("Goodbye")

^ *with open$•(.+)\.txt•, •w•$ as ([a-zA-Z_][a-zA-Z0-9_]*):\n \2\.write$•.+\.•$\nwith open$•\1\.txt•, •a•$ as ([a-zA-Z_][a-zA-Z0-9_]*):\n \3\.write$•.+•$ *$

In IDLE (See Appendix D), create a Python program that begins by writing some text to a file.
The program appends some more text to the file.
The program reads the contents of the file and displays the contents.
Using any filename you like (that ends in .py), save the Python file to the Desktop.
Run the Python program.
If you've coded correctly the contents of the file will display in the IDLE shell.

A Smarter Way to Learn Python / Chapter 65 Exercises

Congratulations. You've aced all the exercises for this chapter.

All of my books include free interactive online exercises that make the knowledge stick.