Create 15. Fix and copy calculations

Week 6 Files and errors/15. Fix and copy calculations

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+'''
+The file calculations.csv contains totals. However, the file is corrupt - each invoice contains an error.
+
+The errors can be either in one of the addends or in the result (but only in one of them). As a result of the error, one of the original numbers in the calculation has been replaced by random letters.
+
+
+
+So, for example, if the calculation had originally been
+2+4=6
+...it could now be in the form, for example
+2+XY=6
+
+or
+ZRQ+4=6
+
+or even
+2+4=UIJMN
+
+
+
+Write a function
+fix_and_copy()
+which reads the invoices from the file calculations.csv, corrects them to their original form and then writes the corrected invoices in the same order to the file corrected_calculations.csv
+'''
+
+
+
+
+# approach 1
+def fix_and_copy():
+    with open('calculations.csv', 'r') as source_file, open('corrected_calculations.csv', 'w') as dest_file:
+        for line in source_file:
+            # Strip whitespace and split the line
+            parts = line.strip().split('=')
+            left_side, result = parts
+            
+            addends = left_side.split('+')
+            
+            lhsdigit = addends[0].isdigit()
+            rhsdigit = addends[1].isdigit()
+            resultdigit = result.isdigit()
+            
+            if lhsdigit == False:
+                lhs = int(result) - int(addends[1])
+                fixed_line = f"{lhs}+{addends[1]}={result}"
+            elif rhsdigit == False:
+                rhs = int(result) - int(addends[0])
+                fixed_line = f"{addends[0]}+{rhs}={result}"
+            else:
+                result = int(addends[0]) + int(addends[1])
+                fixed_line = f"{addends[0]}+{addends[1]}={result}"
+            
+            
+            # If we reach here, we've found the correct fix
+            dest_file.write(fixed_line + '\n')
+                
+        
+# Call the function
+fix_and_copy()
+
+
+
+
+
+
+
+'''error
+
+Error in program execution
+line 135, in
+fix_and_copy()
+File "/tmp/untrusted/test064f7b918-53d7-4381-bdac-1616c59e0764/test.py", line 107, in fix_and_copy
+with open('calculations.csv', 'r') as source_file, open('corrected_calculations.csv', 'w') as dest_file:
+File "/tmp/untrusted/test064f7b918-53d7-4381-bdac-1616c59e0764/test.py", line 13, in open
+if fname in content:
+NameError: name 'content' is not defined
+'''
+