Add examples for the python language

2 files changed, 61 insertions, 0 deletions

diff --git a/languages/p/python/README.md b/languages/p/python/README.md
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+### Download Python 3  
+
+Run with:
+``` 
+python3 lambda-core.py
+```
+
+*made with python 3.11.5*
\ No newline at end of file
diff --git a/languages/p/python/lambda-core.py b/languages/p/python/lambda-core.py
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+++ b/languages/p/python/lambda-core.py
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+# LOGIC
+_true = lambda x: lambda y: x
+_false = lambda x: lambda y: y
+_not = lambda b: b(_false)(_true)
+_and = lambda b1: lambda b2: b1(b2)(_false)
+_or = lambda b1: lambda b2: b1(_true)(b2)
+
+# CHURCH NUMERALS
+_zero = lambda f: lambda x: x
+_succ = lambda n: lambda f: lambda x: f(n(f)(x))
+_pred = lambda n: lambda f: lambda x: n(lambda g: lambda h: h(g(f)))(lambda u: x)(lambda a: a)
+_one = _succ(_zero)
+
+# HELPERS - not pure lambda calculus
+read_bool = lambda b: print(b("t")("f"))
+read_church = lambda n: print(n(lambda x: x+1)(0))
+
+# EXAMPLES
+print("LOGIC")
+print("-------------")
+print("TRUE/FALSE")
+read_bool(_true)
+read_bool(_false)
+
+print("NOT")
+read_bool(_not(_true))
+read_bool(_not(_false))
+
+print("AND")
+read_bool(_and(_true)(_true))
+read_bool(_and(_true)(_false))
+read_bool(_and(_false)(_true))
+read_bool(_and(_false)(_false))
+
+print("OR")
+read_bool(_or(_true)(_true))
+read_bool(_or(_true)(_false))
+read_bool(_or(_false)(_true))
+read_bool(_or(_false)(_false))
+
+print()
+print("CHURCH NUMERALS")
+print("-------------")
+print("ZERO/SUCC")
+read_church(_zero)
+read_church(_one)
+read_church(_succ(_one))
+read_church(_succ(_succ(_one)))
+
+print("PRED")
+read_church(_pred(_one))
+read_church(_pred(_succ(_one)))
+read_church(_pred(_succ(_succ(_one))))