import json
file_name = ‘name.json’
try :
with open(file_name) as f:
username = json.load(f)
except FileNotFoundError:
username = input(“Whats is your name ? ”)
with open(file_name,'w') as f:
json.dump(username,f)
print (f“So im wait you {username}”)
else:
print(f“Welcome back , dear {username}”)

VANISHED

DEATHILAND

то есть вы открыли файл file_name, а джейсон дампите в username