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收起

Python errors All In One

errors ❌

1. from: can't read /var/mail/gpiozero

https://stackoverflow.com/questions/16069816/getting-python-error-from-cant-read-var-mail-bio

2. SyntaxError: Non-ASCII character '\xe6' in file ./test.py on line 32, but no encoding declared; see http://python.org/dev/peps/pep-0263/ for details

http://python.org/dev/peps/pep-0263/

Pyhton 2 不支持中文和 emoji ❌

3. 接收命令行参数 error ❌

• sys

• argparse

• shell script

• tensorflow

• getopt

https://www.cnblogs.com/xgqfrms/p/17273858.html

4. 类型转换 error ❌

https://www.cnblogs.com/xgqfrms/p/17273620.html

demos

#!/usr/bin/env python

# coding: utf8

from gpiozero import LED
from time import sleep

led = LED(12)
# Change 12 to your GPIO pin

# block comments
"""
led.on()
sleep(3)
led.off()
"""

def run(time):
 led.on()
 sleep(time)
 led.off()

def init(n):
 i = 0
 while i < n:
  print(i)
  i += 1
  sleep(1)
  run(1)

# python 接收命令行参数❓
init(7)

bugs

0. UTF8

# -*- coding: UTF-8 -*- ✅
# coding: utf8 ✅
# coding: UTF-8 ✅

Unicode & 中文

#!/usr/bin/python
# -*- coding: UTF-8 -*-

# UTF8 Emoji zh-Hans Test

if(1 < "3"):
    print "ok ✅ 正确"
else:
    print "bug ❌ 错误"

#!/usr/bin/python
# coding: utf8
# coding: UTF-8

# UTF8 Emoji zh-Hans Test

if(1 < "3"):
    print "ok ✅ 正确"
else:
    print "bug ❌ 错误"

1. 类型转换

string to int

#!/usr/bin/env python

# coding: utf8


import sys

# arg1 = sys.argv[1]

from gpiozero import LED
from time import sleep

led = LED(12)
# Change 12 to your GPIO pin

# order, import fisrt
arg1 = sys.argv[1]

print("arg1 =" + arg1)

# block comments
"""
led.on()
sleep(3)
led.off()
"""

def run(time):
 led.on()
 sleep(time)
 led.off()

def init(n):
 i = 0
 while i < n:
  print(i)
  i += 1
  sleep(1)
  run(1)

# python command line args
# init(7)
init(arg1)

refs

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