
variable = 1
print('{}')
# output: {}
print('{{}}')
# output: {{}}
print(f'{{}}')
# output: {}
print(f'{variable}')
# output: 1
print(f'{{variable}}')
# output: {variable}
print('{}'.format(variable))
# output: 1
print('{{}}'.format(variable))
# output: {}
print('{variable}'.format(variable))
# output: error
print('{{variable}}'.format(variable))
# output: {variable}
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