- Assignment expresions,赋值表达式海象运算符,把运算操作和赋值操作放在了一起,代码更加简洁
age=20
if age>18:
print('已成年')
if (age:=20)>18:
print('已成年')
lst = [1, 2, 3, 4, 5, 6]
print(f'lst + [7]={lst + [7]}')
lst = [1, 2, 3, 4, 5, 6]
print(f'{lst + [7] = }')
- 位置限定参数 /
在分隔符“/”左侧的参数,只允许使用位置参数的形式进行传递。
假如一个团队中很多人进行合作开发,函数的定义形式和调用模式是很难规范和统一的。
def add_num(x, y, z=100, /, a=100):
print(x + y + z + a)
print(x + y + z + a)
add_num(1,2)
from multiprocessing import Process
nums=list(range(100))
def work1(nums):
for i in range(100):
nums[i]+=10
print(f"in process1,nums={nums}")
def work2(nums):
print(f"in process2,nums={nums}")
if __name__=='__main__':
p1=Process(target=work1,args=(nums,))
p1.start()
p1.join()
p2 = Process(target=work2, args=(nums,))
p2.start()
from multiprocessing import Process,shared_memory
nums=shared_memory.ShareableList(range(100))
def work1(nums):
for i in range(100):
nums[i]+=10
print(f"in process1,nums={nums}")
def work2(nums):
print(f"in process2,nums={nums}")
if __name__=='__main__':
p1=Process(target=work1,args=(nums,))
p1.start()
p1.join()
p2 = Process(target=work2, args=(nums,))
p2.start()
参考连接:https://docs.python.org/3/whatsnew/3.8.html