PS C:\Users\yashi\OneDrive\桌面\Python Projects> python -m pip list
DEPRECATION: Python 2.7 reached the end of its life on January 1st, 2020. Please upgrade your Python as Python 2.7 is no longer maintained. A future version of pip will drop support for Python 2.7. More details about Python 2 suppo
根据业务需求,我们需要从python中基于PostgreSQL文档的数据库中获取数据。
PostgreSQL:
select info from "spyConfig" where info @> '{"type" : "processmap"}';
它在postgresql接口中按预期工作,这与我希望在python中执行的查询相同。
cur.execute("SELECT info FROM spyConfig WHERE info @> %s",
{'type':'proc
可能重复:
Python手册将范围定义为:
作用域定义块中名称的可见性。如果局部变量是在块中定义的,则其作用域包括该块。如果定义发生在函数块中,则作用域扩展到定义块中包含的任何块,除非包含的块为名称引入不同的绑定。
我有这样的计划:
import random
def f():
a = "Is the scope static?"
if random.randint(0, 1) == 1:
del a
print a
打印失败的可能性为50%:
>>> f()
Is the scope static?
>>&g