学習ノート(9):第2章プログラム設計とデータ構造-Phothonの魔法機能、魅力的なところ、コード量を少なくする2...
2466 ワード
今すぐ学習:https://edu.csdn.net/course/play/25504/304704?utm_source=blogtoedu
# list
d = {'x': 'A', 'y' : 'B', 'z': 'C'}
print([k + '=' + v for k, v in d.items()])
# list[1,2,3,..,10]
print(list(range(1, 11)))
# list[1*1, 2*2, 3*3, ..., 10*10]
print([i * i for i in range(1, 11)])
# 'abc', '123' a1, a2, a3, b1, b2, b3
print([m + n for m in 'abc' for n in '123'])
# if
print([m + n for m in 'a.b.c' for n in '123' if m != '.'])
'''
'''
g = (i * i for i in range(1, 11))
print(g)
print(next(g))
for n in g:# for next
print(n)
# yield
def fib(max):
n,a,b = 0, 0, 1
while n < max:
print(b)
a, b = b, a + b
n += 1
return 'done'
fib(6)
# yield,yield generator
def fib(max):
n,a,b = 0, 0, 1
while n < max:
yield b
a, b = b, a + b
n += 1
return 'done'
g = fib(6)
print(next(g))
for n in g:
print(n)
# try except
while True:
try:
x = next(g)
print(x)
except StopIteration as e:
print(' ',e.value)
break
'''
'''
# Iterable
from _collections_abc import Iterable
print(isinstance([],Iterable))
print(isinstance({},Iterable))
print(isinstance('123',Iterable))
print(isinstance(123,Iterable))
# Iterator
# python __next__ __iter__。 , , , 。
from _collections_abc import Iterator
print(isinstance([],Iterator))
print(isinstance({},Iterator))
print(isinstance('123',Iterator))
print(isinstance(123,Iterator))
print(isinstance(g,Iterator))
# iter()
print(isinstance(iter([]),Iterator))
print(isinstance(iter({}),Iterator))
print(isinstance(iter('abc'),Iterator))
def triangles():
b=[1]
yield b
for i in range(4):
c=[]
for i,k in enumerate(b):
if(i>0):
c.append(k+b[i-1])
else:
c.append(k)
c.append(1)
b = c
yield b
n=0
result=[]
for t in triangles():
print(t)
result.append(t)
n+=1
if n==10:
break
if result==[
[1],
[1,1],
[1,2,1],
[1,3,3,1],
[1,4,6,4,1]
]:
print(' ')
else:
print(' ')