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# mode: run
# tag: lambda
# ticket: t195
__doc__ = u"""
#>>> py_identity = lambda x:x
#>>> py_identity(1) == cy_identity(1)
#True
"""
#cy_identity = lambda x:x
def make_identity():
"""
>>> idcall = make_identity()
>>> idcall(1)
1
>>> idcall(2)
2
"""
return lambda x:x
def make_const0(x):
"""
>>> make_const0(1)()
1
"""
return lambda :x
def make_const1(x):
"""
>>> make_const1(1)(2)
1
>>> make_const1(1)(2)
1
"""
return lambda _:x
def make_const_calc0():
"""
>>> make_const_calc0()()
11
"""
return lambda : 1*2*3+5
def make_const_calc1():
"""
>>> make_const_calc1()(2)
11
"""
return lambda _: 1*2*3+5
def make_const_calc1_xy(x):
"""
>>> make_const_calc1_xy(8)(2)
27
"""
return lambda y: x*y+(1*2*3+5)
def make_lambda_lambda(x):
"""
>>> make_lambda_lambda(1)(2)(4)
7
"""
return lambda y : \
lambda z:x+y+z
def make_typed_lambda_lambda(int x):
"""
>>> make_typed_lambda_lambda(1)(2)(4)
7
>>> partial_lambda = make_typed_lambda_lambda(1)(2)
>>> partial_lambda(4)
7
>>> partial_lambda(5)
8
"""
return lambda int y : \
lambda int z:x+y+z
def pass_lambda(f):
"""
>>> def f(a, lfunc): return lfunc(a,2)
>>> pass_lambda(f)
12
"""
return f(1, lambda a, b : a*10+b)
def pass_lambda_with_args(f):
"""
>>> def f(a, lfunc): return lfunc(a,2,3)
>>> pass_lambda_with_args(f)
123
"""
return f(1, lambda a, *args : (a*10 + args[0])*10 + args[1])
def pass_lambda_with_args_kwargs(f):
"""
>>> def f(a, lfunc): return lfunc(a,2,3, b=4)
>>> pass_lambda_with_args_kwargs(f)
1234
"""
return f(1, lambda a, *args, **kwargs : ((a*10 + args[0])*10 + args[1])*10 + kwargs['b'])
def pass_lambda_with_args_kwargs_kwonly_args(f):
"""
>>> def f(a, lfunc): return lfunc(a,2,3, b=4, c=5)
>>> pass_lambda_with_args_kwargs_kwonly_args(f)
12345
"""
return f(1, lambda a, *args, b, **kwargs : (((a*10 + args[0])*10 + args[1])*10 + b)*10 + kwargs['c'])
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