def build_lambda(word):
def body(letters):
if not letters:
return 'x'
elif letters[0] == 'A':
return 'car(' + body(letters[1:]) + ')'
else:
return 'cdr(' + body(letters[1:]) + ')'
return eval('lambda x: ' + body(word)) # Danger
def _eval(expr):
"""Evaluate an expression in the global environment"""
from src.eval import eval
return eval(expr, global_env)
