1、三元運算
第一種
value = "變量1" if a>b else "變量2"
第二種
value = ("變量1","變量2")[a>b]
第三種
value = {"變量1","變量2"}[a>b]
傳統寫法
if a>b :
value = "變量1"
else :
value = "變量2"
2、for循環
單層for循環
# 傳統寫法
v = []
for r in [1,2,3]:
v.apend(r+1)
# 簡寫
v = [r+1 for r in s]
# v 輸出 [2, 3, 4]
雙層for循環
rrr = [[1,2],[3,4]]
# 傳統寫法
v = []
for rr in rrr:
for r in rr:
v.apend(r+1)
# 簡寫
v = [r+1 for rr in rrr for r in rr]
# v 輸出 [2, 3, 4, 5]
for循環+if
x = [1,2,3,4,5,6,7]
# 傳統寫法
for i in x:
if i>3:
print(i)
# 簡寫
[print(i) for i in x if i>3 ]
3、匿名函數
例:
x = 3
v = (lambda k: k+3)(x)
# v 輸出6
例:
v = list(map(lambda x: x * 2, [1, 2, 3, 4, 5]))
# v 輸出: [2, 4, 6, 8, 10]