Create 18. Own programming language, Part 1

Week 7 Libraries and More Python/18. Own programming language, Part 1

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+'''
+Write a function
+
+execute(code: str) -> str
+
+which takes a program written in your programming language as a parameter and returns the output of the program.
+
+
+
+
+At this point, the program must know the following commands:
+
+LET variable=value
+The command sets the value of the variable to the given integer. The variable is one of a, b, c or d - no other variable names are allowed. If the variable already has a value, the old value is overwritten.
+
+
+
+PRINT variable
+This command adds the value of the variable and the line break to the output. The value of the variable must be defined before it is printed.
+
+
+
+
+
+
+Three example programs for testing:
+
+LET a=10
+PRINT a
+The program returns a printout
+10
+
+
+
+Program 2:
+LET a=100
+LET b=200
+PRINT a
+PRINT b
+The program returns the result:
+100
+200
+
+
+
+Program 3:
+LET c=10000
+LET d=-10000
+PRINT c
+PRINT d
+LET c=10
+LET d=-10
+PRINT c
+PRINT d
+The program returns the result:
+10000
+-10000
+10
+-10
+'''
+
+
+
+
+
+# approach 1
+def execute(code: str) -> str:
+    variables = {'a': 0, 'b': 0, 'c': 0, 'd': 0}
+    output = []
+    
+    for line in code.split('\n'):
+        line = line.strip()
+        if line.startswith('LET'):
+            _, assignment = line.split(' ', 1)
+            var, value = assignment.split('=')
+            if var in variables:
+                variables[var] = int(value)
+            else:
+                raise ValueError(f"Invalid variable name: {var}")
+        elif line.startswith('PRINT'):
+            _, var = line.split()
+            if var in variables:
+                output.append(str(variables[var]))
+            else:
+                raise ValueError(f"Undefined variable: {var}")
+        elif line:  # Ignore empty lines
+            raise ValueError(f"Invalid command: {line}")
+    
+    return '\n'.join(output)
+
+
+
+eg1='''LET a=10
+PRINT a
+'''
+execute(eg1)
+
+eg2='''LET a=100
+LET b=200
+PRINT a
+PRINT b
+'''
+
+eg3='''LET c=10000
+LET d=-10000
+PRINT c
+PRINT d
+LET c=10
+LET d=-10
+PRINT c
+PRINT d
+'''