# #
## 1 ##
1000
list Python generator
Python yield generator
yield yield next()
## 2 ##
`[]` `()`
```python
# -*- coding: UTF-8 -*-
gen= (x * x for x in range(10))
print(gen)
```
```txt
```
List generator `[]` `()` ( yield ) ( lazy evaluation call by need ) evaluated
## 3 ##
for
```python
# -*- coding: UTF-8 -*-
gen= (x * x for x in range(10))
for num in gen :
print(num)
```
next()
## 4 ##
`[]` `()`
for
```python
# -*- coding: UTF-8 -*-
def my_function():
for i in range(10):
print ( i )
my_function()
```
```txt
0
1
2
3
4
5
6
7
8
9
```
`print ( i )` `yield i`
```python
# -*- coding: UTF-8 -*-
def my_function():
for i in range(10):
yield i
print(my_function())
```
```txt
```
```python
# -*- coding: UTF-8 -*-
def fibon(n):
a = b = 1
for i in range(n):
yield a
a, b = b, a + b
#
for x in fibon(1000000):
print(x , end = ' ')
```
generator return generator next() yield yield
```python
# -*- coding: UTF-8 -*-
def odd():
print ( 'step 1' )
yield ( 1 )
print ( 'step 2' )
yield ( 3 )
print ( 'step 3' )
yield ( 5 )
o = odd()
print( next( o ) )
print( next( o ) )
print( next( o ) )
```
```txt
step 1
1
step 2
3
step 3
5
```
odd generator yield 3 yield yield `print( next( o ) ) ` , generator
## 5 ##
```python
# -*- coding: UTF-8 -*-
def triangles( n ): #
L = [1]
while True:
yield L
L.append(0)
L = [ L [ i -1 ] + L [ i ] for i in range (len(L))]
n= 0
for t in triangles( 10 ): #
print(t)
n = n + 1
if n == 10:
break
```
```txt
[1]
[1, 1]
[1, 2, 1]
[1, 3, 3, 1]
[1, 4, 6, 4, 1]
[1, 5, 10, 10, 5, 1]
[1, 6, 15, 20, 15, 6, 1]
[1, 7, 21, 35, 35, 21, 7, 1]
[1, 8, 28, 56, 70, 56, 28, 8, 1]
[1, 9, 36, 84, 126, 126, 84, 36, 9, 1]
```