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File -> Settings -> Project -> Python Interpreter -> Install -> Available Packages -> Manage Repositories

https://mirrors.163.com/pypi/simple/
https://mirrors.ustc.edu.cn/pypi/web/simple
https://pypi.tuna.tsinghua.edu.cn/simple
https://mirrors.aliyun.com/pypi/simple/

#自定义函数，a*a+b*b=c*c，开平方求c值
def Pythagorean_theorem(a,b):
    return 'The right triangle third side\'s length is {}'.format((a**2 + b**2)**(1/2))
#引号内的字符串出现符号时需要使用\转义
#使用.format()将格式化的运算值填入字符串中

#调用函数，传入参数并打印函数返回
print(Pythagorean_theorem(3,4))

PS C:\Users\harveymei> & C:/Users/harveymei/AppData/Local/Programs/Python/Python38/python.exe c:/Users/harveymei/hello.py
The right triangle third side's length is 5.0
PS C:\Users\harveymei> 

#自定义函数，重量克转化为千克
def g2kg(g):
    kg = g / 1000
    return str(kg) + 'kg'

#调用函数并赋值变量
result = g2kg(2500)
#打印变量
print(result)

PS C:\Users\harveymei> & C:/Users/harveymei/AppData/Local/Programs/Python/Python38/python.exe c:/Users/harveymei/hello.py
2.5kg
PS C:\Users\harveymei>

查看系统时间日期配置

[centos@dev ~]$ sudo timedatectl
[sudo] password for centos:
               Local time: Wed 2020-07-01 09:21:55 UTC
           Universal time: Wed 2020-07-01 09:21:55 UTC
                 RTC time: Wed 2020-07-01 09:21:55
                Time zone: UTC (UTC, +0000)
System clock synchronized: yes
              NTP service: active
          RTC in local TZ: no
[centos@dev ~]$
[centos@dev ~]$ sudo timedatectl --help
timedatectl [OPTIONS...] COMMAND ...

Query or change system time and date settings.

  -h --help                Show this help message
     --version             Show package version
     --no-pager            Do not pipe output into a pager
     --no-ask-password     Do not prompt for password
  -H --host=[USER@]HOST    Operate on remote host
  -M --machine=CONTAINER   Operate on local container
     --adjust-system-clock Adjust system clock when changing local RTC mode
     --monitor             Monitor status of systemd-timesyncd
  -p --property=NAME       Show only properties by this name
  -a --all                 Show all properties, including empty ones
     --value               When showing properties, only print the value

Commands:
  status                   Show current time settings
  show                     Show properties of systemd-timedated
  set-time TIME            Set system time
  set-timezone ZONE        Set system time zone
  list-timezones           Show known time zones
  set-local-rtc BOOL       Control whether RTC is in local time
  set-ntp BOOL             Enable or disable network time synchronization

systemd-timesyncd Commands:
  timesync-status          Show status of systemd-timesyncd
  show-timesync            Show properties of systemd-timesyncd
[centos@dev ~]$

修改系统时区

[centos@dev ~]$ sudo timedatectl set-timezone Asia/Hong_Kong
[centos@dev ~]$ date
Wed Jul  1 17:22:59 HKT 2020
[centos@dev ~]$
[centos@dev ~]$ sudo timedatectl
               Local time: Wed 2020-07-01 17:24:20 HKT
           Universal time: Wed 2020-07-01 09:24:20 UTC
                 RTC time: Wed 2020-07-01 09:24:20
                Time zone: Asia/Hong_Kong (HKT, +0800)
System clock synchronized: yes
              NTP service: active
          RTC in local TZ: no
[centos@dev ~]$