write a code that takes in three ints and write 'equal' if all three are equal and 'not equal' otherwise.

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
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I'm trying to write a code that takes in three ints and write 'equal' if all three are equal and 'not equal' otherwise. I want 3 3 3 to print equal and 3 2 3 print not equal.
This section covers a Python script designed to compare three values. 

**Python Code Explanation:**

The script begins by importing the `sys` module, which allows for command-line arguments:
```python
import sys
```

Variables `a`, `b`, and `c` are intended to hold integer values converted from command-line arguments:
```python
a = int(sys.argv[3])
b = int(sys.argv[3])
c = int(sys.argv[3])
```

**Logical Conditions:**

1. **Comparing `a` and `b`:**
   - If `a` is equal to `b`, the script prints "equal".
   - Otherwise, it prints "not equal":
   ```python
   if a == b:
       print("equal")
   else:
       print("not equal")
   ```

2. **Comparing `b` and `c`:**
   - Similarly, if `b` is equal to `c`, it prints "equal".
   - Otherwise, it prints "not equal":
   ```python
   if b == c:
       print("equal")
   else:
       print("not equal")
   ```

**Error Handling:**

The console area shows an error from the last attempted run:
```
Traceback (most recent call last):
  File "comparethree.py", line 3, in <module>
    a = int(sys.argv[3])
IndexError: list index out of range
```

**Explanation of the Error:**

- The `IndexError: list index out of range` occurs because the script tried to access a fourth command-line argument (`sys.argv[3]`), but fewer arguments were provided.
- To fix this, ensure that enough arguments are passed when executing the script from the command line. 

**Conclusion:**

This script compares three values using command-line inputs. Correct input management and error handling are essential to prevent runtime errors like `IndexError`.
Transcribed Image Text:This section covers a Python script designed to compare three values. **Python Code Explanation:** The script begins by importing the `sys` module, which allows for command-line arguments: ```python import sys ``` Variables `a`, `b`, and `c` are intended to hold integer values converted from command-line arguments: ```python a = int(sys.argv[3]) b = int(sys.argv[3]) c = int(sys.argv[3]) ``` **Logical Conditions:** 1. **Comparing `a` and `b`:** - If `a` is equal to `b`, the script prints "equal". - Otherwise, it prints "not equal": ```python if a == b: print("equal") else: print("not equal") ``` 2. **Comparing `b` and `c`:** - Similarly, if `b` is equal to `c`, it prints "equal". - Otherwise, it prints "not equal": ```python if b == c: print("equal") else: print("not equal") ``` **Error Handling:** The console area shows an error from the last attempted run: ``` Traceback (most recent call last): File "comparethree.py", line 3, in <module> a = int(sys.argv[3]) IndexError: list index out of range ``` **Explanation of the Error:** - The `IndexError: list index out of range` occurs because the script tried to access a fourth command-line argument (`sys.argv[3]`), but fewer arguments were provided. - To fix this, ensure that enough arguments are passed when executing the script from the command line. **Conclusion:** This script compares three values using command-line inputs. Correct input management and error handling are essential to prevent runtime errors like `IndexError`.
Expert Solution
Command Line Arguments in Python:

Command Line Arguments: The arguments given after the name of the program in the command line shell of the operating system.

Using sys.argv, one can deal with the CLAs. 

  • len(sys.argv) - It gives us the number/ the count of the CLAs.
  • sys.argv[0] - It is the name of the current Python script.
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