python 内包表記まとめ

# 内包表記なし
t = (1, 2, 3, 4, 5)

r = []
for i in t:
  r.append(i)

print("r =",r)

# r = [1, 2, 3, 4, 5]

#############
# 内包表記あり

r = [i for i in t] 

print("r =",r)

# r = [1, 2, 3, 4, 5]

# 内包表記なし

t = (1, 2, 3, 4, 5)

r = []
for i in t:
  if i % 2 == 0:
    r.append(i)

print("r =",r)

# r = [2, 4]

#############
# 内包表記あり
t = (1, 2, 3, 4, 5)

r = [i for i in t if i % 2 == 0] 

print("r =",r)

# r = [2, 4]

# 内包表記なし

t = (1, 2, 3, 4, 5)
t2 = (5, 6, 7, 8, 9, 10)

r = []
for i in t:
  for j in t2:
    r.append(i * j)

print("r =",r)

# r = [5, 6, 7, 8, 9, 10, 10, 12, 14, 16, 18, 20, 15, 18, 21, 24, 27, 30, 20, 24, 28, 32, 36, 40, 25, 30, 35, 40, 45, 50]

#############
# 内包表記あり

t = (1, 2, 3, 4, 5)
t2 = (5, 6, 7, 8, 9, 10)

r = [i * j for i in t for j in t2]

print("r =",r)

# r  = [5, 6, 7, 8, 9, 10, 10, 12, 14, 16, 18, 20, 15, 18, 21, 24, 27, 30, 20, 24, 28, 32, 36, 40, 25, 30, 35, 40, 45, 50]

# 内包表記なし

w = ['mon', 'tue', 'wed']
f = ['coffee', 'milk', 'water']

d = {}
for x, y in zip(w, f): # zipは順番に取り出す関数
  d[x] = y

print(d)

# {'mon': 'coffee', 'tue': 'milk', 'wed': 'water'}

#############
# 内包表記あり

w = ['mon', 'tue', 'wed']
f = ['coffee', 'milk', 'water']

d = {x: y for x, y in zip(w, f)}

print(d)

# {'mon': 'coffee', 'tue': 'milk', 'wed': 'water'}

# 内包表記なし

s = set()

for i in range(10):
  s.add(i) # set型（集合）にappendは使えない

print(s)

# {0, 1, 2, 3, 4, 5, 6, 7, 8, 9}

#############
# 内包表記あり

s = {i for i in range(10)}
print(s)

# {0, 1, 2, 3, 4, 5, 6, 7, 8, 9}

# ifを入れる場合

s = set()

for i in range(10):
  if i % 2 ==0:
    s.add(i)

print(s)

# 内包表記なし

def g():
  for i in range(5):
    yield i

g = g ()
print(type(g))

print(next(g))
print(next(g))
print(next(g))
print(next(g))
print(next(g))

#<class 'generator'>
#0
#1
#2
#3
#4

#############
# 内包表記あり

g = ( i for i in range(5)) # 一見タプルになりそうだがならない

print(type(g))

print(next(g))
print(next(g))
print(next(g))
print(next(g))
print(next(g))

#<class 'generator'>
#0
#1
#2
#3
#4

# ifを入れることもできる

g = ( i for i in range(5) if i % 2 == 0)
print(type(g))

print(next(g))
print(next(g))
print(next(g))

#<class 'generator'>
#0
#2
#4