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ast.Interactive

root and base nodes

The root node for mode='single': one interactive input line, as typed at the REPL; body is a list of statements.

Syntax

ast.parse(source, mode='single')  # → ast.Interactive

The difference from Module is behaviour, not shape: code compiled in 'single' mode prints the value of every expression statement, just like the REPL — exec(compile('1 + 2', '<in>', 'single')) prints 3, while 'exec' mode stays silent. The mode accepts one logical line or one compound statement; two separate lines are a SyntaxError.

Examples

import ast
tree = ast.parse('x = 1; y = 2', mode='single')
print(type(tree).__name__, len(tree.body))  # → Interactive 2
exec(compile(ast.parse('1 + 2', mode='single'), '<in>', 'single'))
# → 3

import ast
try:
    ast.parse('x = 1\ny = 2', mode='single')
except SyntaxError as e:
    print(type(e).__name__)  # → SyntaxError

See also

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