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Update page 'Day 2 homework - Sloetjes'

xuanyi.wang
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Day 2 homework - Sloetjes.md
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# Xuanyi Wang\_Day-2\_Homework\_03/31/23 # Xuanyi Wang\_Day-2\_Homework\_03/31/23
** **
##### 1. Annotate the following python expressions with the specific types of each literal, as well as the overall return value:** 1. Annotate the following python expressions with the specific types of each literal, as well as the overall return value:**
> i. i = 3 > i. i = 3
> >
> ii. f = 3.0 > ii. f = 3.0
@@ -24,7 +24,7 @@
``` ```
The overall return value of each expression is the value assigned to the corresponding variable, which is the literal itself. The overall return value of each expression is the value assigned to the corresponding variable, which is the literal itself.
**##### 2. For each of the types string, bytestring, integer, floating point, and imaginary literals, construct a 5x5 table showing what happens when the character "0" or number 0 is compared to each other type.** **2. For each of the types string, bytestring, integer, floating point, and imaginary literals, construct a 5x5 table showing what happens when the character "0" or number 0 is compared to each other type.**
| | **'0'** | **b'0'** | **0** | **0.0**| **0j** | | | **'0'** | **b'0'** | **0** | **0.0**| **0j** |
|---|---------|---------|---------|---------|---------| |---|---------|---------|---------|---------|---------|
@@ -34,7 +34,7 @@ The overall return value of each expression is the value assigned to the corresp
| **0.0**| Not equal | Not equal | Equal | Equal | Not Equal | | **0.0**| Not equal | Not equal | Equal | Equal | Not Equal |
| **0j** | Not equal | Not equal | Equal | Not equal| Equal | | **0j** | Not equal | Not equal | Equal | Not equal| Equal |
**##### 3. Now do the same thing for the + and == operators for each pair of types in two other 5x5 tables.** **3. Now do the same thing for the + and == operators for each pair of types in two other 5x5 tables.**
###### The "+" operator case: ###### The "+" operator case:
| | **'0'** | **b'0'** | **0** | **0.0**| **0j** | | | **'0'** | **b'0'** | **0** | **0.0**| **0j** |
@@ -55,7 +55,7 @@ The overall return value of each expression is the value assigned to the corresp
| **0.0**| False | False | True | True| False | | **0.0**| False | False | True | True| False |
| **0j** | False | False | True | False| True | | **0j** | False | False | True | False| True |
**##### 4. Write a small program that uses the AST module to open the lexer/parser example, and dumps the resulting AST. See if there are any arguments to the parse method which make the output easier to read.** **4. Write a small program that uses the AST module to open the lexer/parser example, and dumps the resulting AST. See if there are any arguments to the parse method which make the output easier to read.**
``` ```
import ast import ast
@@ -71,13 +71,13 @@ tree = ast.parse(source)
print(ast.dump(tree, indent=4)) print(ast.dump(tree, indent=4))
``` ```
**##### 5. What does this do? `print("\007")` Can you figure out why?** **5. What does this do? `print("\007")` Can you figure out why?**
The statement `print("\007")` prints **a bell character to the console**. The `“\007”` escape sequence represents **the ASCII code for the bell character**, which is also known as the alert or bell control character. The statement `print("\007")` prints **a bell character to the console**. The `“\007”` escape sequence represents **the ASCII code for the bell character**, which is also known as the alert or bell control character.
When this character is printed to a console or terminal, it can produce **an audible bell sound or visual flash**, depending on the configuration of the console or terminal. The behavior can **vary depending on the operating system and the type of console or terminal being used**. When this character is printed to a console or terminal, it can produce **an audible bell sound or visual flash**, depending on the configuration of the console or terminal. The behavior can **vary depending on the operating system and the type of console or terminal being used**.
**##### 6. What does this do? `print("abcdefg\rhijklmnop")` Can you figure out why?** **6. What does this do? `print("abcdefg\rhijklmnop")` Can you figure out why?**
The code `print("abcdefg\rhijklmnop")` **will output `"hijklmnopg"` on the console**, replacing the first character of `"abcdefg"` with the character `'h'`. The reason for this is the `'\r'` character in the middle of the string. The code `print("abcdefg\rhijklmnop")` **will output `"hijklmnopg"` on the console**, replacing the first character of `"abcdefg"` with the character `'h'`. The reason for this is the `'\r'` character in the middle of the string.
@@ -85,7 +85,7 @@ In Python, **the `'\r'` character is a carriage return character**, which instru
So in this case, the string "abcdefg" is printed, then **the `'\r'` character moves the cursor back to the beginning of the line**, and the string "hijklmnop" is printed, **overwriting the first character of `"abcdefg"` with the character `'h'`**. This results in the output `"hijklmnopdefg"` being printed to the console or terminal. So in this case, the string "abcdefg" is printed, then **the `'\r'` character moves the cursor back to the beginning of the line**, and the string "hijklmnop" is printed, **overwriting the first character of `"abcdefg"` with the character `'h'`**. This results in the output `"hijklmnopdefg"` being printed to the console or terminal.
**##### 7. This is an HTTP server. Run it and connect to http://localhost:8000 . Why doesn't this do the same thing as what you see above? (don't forget to shut down the HTTP server afterward.)** **7. This is an HTTP server. Run it and connect to http://localhost:8000 . Why doesn't this do the same thing as what you see above? (don't forget to shut down the HTTP server afterward.)**
``` ```
import http.server import http.server
@@ -136,7 +136,7 @@ httpd.serve_forever()
``` ```
**##### 8. Think of a way someone might try to commit a crime or hide an embezzlement scheme using the answers to the above two questions. Hint: applications usually output on web pages, but developers and system administrators usually troubleshoot in the console.** **8. Think of a way someone might try to commit a crime or hide an embezzlement scheme using the answers to the above two questions. Hint: applications usually output on web pages, but developers and system administrators usually troubleshoot in the console.**
##### Answer: ##### Answer:
One way someone might try to hide an embezzlement scheme using the answers to the above question is by using the `"\r"` character to overwrite the console output of a financial transaction. One way someone might try to hide an embezzlement scheme using the answers to the above question is by using the `"\r"` character to overwrite the console output of a financial transaction.