No errors report,
This'sreported.
This is a glance at lambda, it enables you to write a function in a single line as you do in mathematic into the computer directly.
As illustrated above,
the the equals symbol = works for simple data(1 and 'value') type and simple expression(n**2 + 2*n + 1).
Try this,:
How about compoudedcompound statement,
Tada,
Analyse analyse it, 'm' is name, 'n**2 + 2*n + 1' is value.: is a variant of '='.
Find it, if just for understanding, everything starts from assignment and everything is assignment.
Now return to lambda,
We we have a function named 'm'
Try,:
There'sThere are two names of 'm' here,function function m already has a name, duplicated.
lambadalambdain an inline function which enable you to write a funtionfunction in one straight line as does in mathematicslambadalambdais anonymous
No errors report,
This's a glance at lambda, it enables you to write a function in a single line as you do in mathematic into the computer directly.
As illustrated above,
the equals symbol = works for simple data(1 and 'value') type and simple expression(n**2 + 2*n + 1).
Try this,
How about compouded statement,
Tada,
Analyse it, 'm' is name, 'n**2 + 2*n + 1' is value.: is a variant of '='.
Find it, if just for understanding, everything starts from assignment and everything is assignment.
Now return to lambda,
We have a function named 'm'
Try,
There's two names of 'm' here,function m already has a name, duplicated.
lambadain an inline function which enable you to write a funtion in one straight line as does in mathematicslambadais anonymous
No errors reported.
This is a glance at lambda, it enables you to write a function in a single line as you do in mathematic into the computer directly.
As illustrated above, the equals symbol = works for simple data(1 and 'value') type and simple expression(n**2 + 2*n + 1).
Try this:
How about compound statement,
Tada, analyse it, 'm' is name, 'n**2 + 2*n + 1' is value.: is a variant of '='.
Find it, if just for understanding, everything starts from assignment and everything is assignment.
Now return to lambda, we have a function named 'm'
Try:
There are two names of 'm' here, function m already has a name, duplicated.
lambdain an inline function which enable you to write a function in one straight line as does in mathematicslambdais anonymous
Error reports, you
you cannot write a mathematic directly as code,'n' should be defined or be assigned to a value.
No errors report,
This's a glance at lambda, it enables you to write a siglefunction in a single line ofas you do in mathematic function into the computer directly.
We
We will see it later.
As illustrated above, the
the equals symbol = works for simple data(1 and 'value') type and simple expression(n**2 + 2*n + 1).
Tada,
Analyse it, 'm' is name, 'n**2 + 2*n + 1' is value.: is a variant of '='.
Find it, if just for understanding, everything starts from assignment and everything is assignment.
Error reports, you cannot write a mathematic directly as code,'n' should be defined or be assigned to a value.
No errors report
This's a glance at lambda, it enables you to write a sigle line of mathematic function into computer directly.
We will see it later.
As illustrated above, the equals symbol = works for simple data(1 and 'value') type and simple expression(n**2 + 2*n + 1).
Tada,
Analyse it, 'm' is name, 'n**2 + 2*n + 1' is value.: is a variant of '='.
Find it, if just for understanding, everything starts from assignment and everything is assignment.
Error reports,
you cannot write a mathematic directly as code,'n' should be defined or be assigned to a value.
No errors report,
This's a glance at lambda, it enables you to write a function in a single line as you do in mathematic into the computer directly.
We will see it later.
As illustrated above,
the equals symbol = works for simple data(1 and 'value') type and simple expression(n**2 + 2*n + 1).
Tada,
Analyse it, 'm' is name, 'n**2 + 2*n + 1' is value.: is a variant of '='.
Find it, if just for understanding, everything starts from assignment and everything is assignment.
For a person without a comp-sci background, what is a lambda in the world of Computer Science?
I will illustrate it intuitively step by step in simple and readable python codes.
In short, a lambda is just an anonymous and inline function.
Let's start from assignment to understand lambdas as a freshman with background of basic arithmetic.
The blueprint of assignment is 'the name = value', see:
In [1]: x = 1
...: y = 'value'
In [2]: x
Out[2]: 1
In [3]: y
Out[3]: 'value'
'x', 'y' are names and 1, 'value' are values. Try a function in mathematics
In [4]: m = n**2 + 2*n + 1
NameError: name 'n' is not defined
Error reports, you cannot write a mathematic directly as code,'n' should be defined or be assigned to a value.
In [8]: n = 3.14
In [9]: m = n**2 + 2*n + 1
In [10]: m
Out[10]: 17.1396
It works now,what if you insist on combining the two seperarte lines to one.
There comes lambda
In [13]: j = lambda i: i**2 + 2*i + 1
In [14]: j
Out[14]: <function __main__.<lambda>>
No errors report
This's a glance at lambda, it enables you to write a sigle line of mathematic function into computer directly.
We will see it later.
Let's continue on digging deeper on 'assignment'.
As illustrated above, the equals symbol = works for simple data(1 and 'value') type and simple expression(n**2 + 2*n + 1).
Try this,
In [15]: x = print('This is a x')
This is a x
In [16]: x
In [17]: x = input('Enter a x: ')
Enter a x: x
It works for simple statements,there's 11 types of them in python 7. Simple statements — Python 3.6.3 documentation
How about compouded statement,
In [18]: m = n**2 + 2*n + 1 if n > 0
SyntaxError: invalid syntax
#or
In [19]: m = n**2 + 2*n + 1, if n > 0
SyntaxError: invalid syntax
There comes def enable it working
In [23]: def m(n):
...: if n > 0:
...: return n**2 + 2*n + 1
...:
In [24]: m(2)
Out[24]: 9
Tada,
Analyse it, 'm' is name, 'n**2 + 2*n + 1' is value.: is a variant of '='.
Find it, if just for understanding, everything starts from assignment and everything is assignment.
Now return to lambda,
We have a function named 'm'
Try,
In [28]: m = m(3)
In [29]: m
Out[29]: 16
There's two names of 'm' here,function m already has a name, duplicated.
It's formatting like:
In [27]: m = def m(n):
...: if n > 0:
...: return n**2 + 2*n + 1
SyntaxError: invalid syntax
It's not a smart strategy, so error reports
We have to delete one of them,set a function without a name.
m = lambda n:n**2 + 2*n + 1
It's called 'anonymous function'
In conclusion,
lambadain an inline function which enable you to write a funtion in one straight line as does in mathematicslambadais anonymous
Hope, this helps.