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class CtatDatabase:
def __init__(self):
self.data = {}
def set(self, key, value):
self.data[key] = value
def get(self, key):
return self.data.get(key)
def delete(self, key):
if key in self.data:
del self.data[key]
def list_keys(self):
return list(self.data.keys())
def clear(self):
self.data.clear()
# Example Usage:
if __name__ == "__main__":
db = CtatDatabase()
db.set("name", "ctat")
db.set("language", "Python")
db.set("version", "1")
print("Name:", db.get("name"))
print("Language:", db.get("language"))
print("Keys:", db.list_keys())
db.delete("version")
print("Keys after deletion:", db.list_keys())
db.clear()
print("Keys after clearing:", db.list_keys())
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