Python 重新运行脚本时找不到脚本模块

Question

我是运行 RaspberryPi 4 上的 python 脚本，今天当我再次运行该脚本时，它向我显示错误 ModuleNotFoundError: No module named 'adafruit_ssd1306' 虽然我运行昨天大约有 10 次相同的脚本，它运行完全没有任何错误。我没有更改脚本中的任何内容，甚至没有更改它的位置。我尝试强制重新安装库，运行来自另一个位置的脚本，重新启动 pi，运行它作为 sudo 但它们中的 none 都起作用了。通过使用 pip3 freeze 它表明该软件包已安装并尝试再次安装该软件包表明要求已经满足。

Python版本：3.7

Main.py

import time
import board
import digitalio
from PIL import Image, ImageDraw, ImageFont
import adafruit_ssd1306
import requests

WIDTH = 128
HEIGHT = 64  # Change to 64 if needed
BORDER = 5

BASE_URL = "https://api.openweathermap.org/data/2.5/weather?"
API_KEY = "API Key"
sign = '°'

# Use for I2C.
i2c = board.I2C()
oled = adafruit_ssd1306.SSD1306_I2C(WIDTH, HEIGHT, i2c, addr=0x3C)

dir_pin = digitalio.DigitalInOut(board.D23)
step_pin = digitalio.DigitalInOut(board.D24)
call_b = digitalio.DigitalInOut(board.D18)

dir_pin.direction = digitalio.Direction.INPUT
step_pin.direction = digitalio.Direction.INPUT
call_b.direction = digitalio.Direction.INPUT
dir_pin.pull = digitalio.Pull.UP
step_pin.pull = digitalio.Pull.UP

prev_value = True

cities = ['Delhi','Tokyo','London','San Francisco',
        'kanpur','Mumbai','portugal','Toronto','Sydney','Paris','New York','Dubai',
        'Moscow','Rome','Madrid','Riyadh','Bangkok','Cairo','Istanbul','Kolkata',
        'Beijing','Seoul','Shanghai','Osaka','Hong Kong','Bangalore','Kathmandu',
        'Chennai','Kathmandu','Manila','Jakarta','Tehran','Baghdad','Riyadh','Abu Dhabi',
        'Dubai','Kuala Lumpur','Chennai','Kathmandu','Manila','Jakarta','Tehran','Baghdad']

font_size = 12
font = ImageFont.truetype('/home/pi/Desktop/Poppins-Regular.ttf', font_size)
font_big = ImageFont.truetype('/home/pi/Desktop/Poppins-Regular.ttf', font_size+4)
font_xl = ImageFont.truetype('/home/pi/Desktop/Poppins-Regular.ttf', font_size+7)

max_cities = len(cities) - 1
value = 0



def get_temp(city):
        url = BASE_URL + "q=" + city + "&appid=" + API_KEY
        r = requests.get(url)
        if r.status_code == 200:
                data = r.json()
                temp = data['main']['temp']
                humidity = data['main']['humidity']
        temp = int(temp)
        humidity = int(humidity)
        temp = temp - 273
        #humidity = humidity+"%"

        temp = str(temp)+sign+'c'
        # h = "Humidity: "+str(humidity)
        return temp

def create_image(temp,city):
        image = Image.new("1", (oled.width, oled.height))
        draw = ImageDraw.Draw(image)
        (fw,fh) = font.getsize(city)
        (w,h) = font_xl.getsize(temp)
        draw.text((128//2 - fw//2,12),city,fill=255,font=font) # city name
        draw.text((128//2 - w//2,30),temp,fill=255,font=font_xl) # temp
        return image

def text_image(city):
        image_ = Image.new("1", (oled.width, oled.height))
        draw = ImageDraw.Draw(image_)
        (font_width, font_height) = font_big.getsize(city)
        draw.text((128//2 - font_width//2, 64//2 - font_height//2),city, font=font_big, fill=255)
        oled.fill(0)
        oled.image(image_)
        oled.show()

g = "Temprature\n     Meter"
intro = Image.new("1", (oled.width, oled.height))
d = ImageDraw.Draw(intro)
# Draw text
(font_width, font_height) = font.getsize(g)
d.text((20, 6),
        g, font=font_big, fill=255)

oled.fill(0)
oled.image(intro)
oled.show()
timer = 0

while True:
        if prev_value != step_pin.value:
                if step_pin.value == False:
                        if dir_pin.value == False:

                                print("left")  # left
                                value = value + 1
                                if value > max_cities:
                                        value = 1
                                print(value)
                                selected_city = cities[value]
                                print(selected_city)
                                text_image(selected_city)

                        else:
                                print("right")  # right
                                if value == 0:
                                        value = max_cities
                                else:
                                        value = value - 1
                                print(value)
                                selected_city = cities[value]
                                print(selected_city)
                                text_image(selected_city)
                                prev_value = step_pin.value

        while call_b.value == False:
                timer = timer+1

        if timer > 70000 and timer < 150000:

                oled.fill(0)
                oled.show()
                timer = 0
                print("blank")
                time.sleep(2)
                print("active")

        elif timer < 15000 and timer > 500:

                t = get_temp(selected_city)
                print(t)
                 # display the data to the OLED
                image = create_image(t,selected_city)
                oled.fill(0) #clear display
                oled.show()
                oled.image(image)
                oled.show()
                timer = 0
                time.sleep(1)
        else:
            timer = 0

Answer 1

1- 确保您输入的模块名称正确

2- 确保使用正确的 python 版本

python3:

python3 script.py

3- 还要确保它安装了正确的 pip 安装程序，您可能错误地将 pip 用于 python2

python3 -m pip install some_module

4- 创建虚拟环境的更好方法

virtualenv -p python3 env
# then
. env/bin/activate
python              # ← will run python3

你可以阅读

this answer on stack overflow about venv and pip versions

和official documentation for venv

如果可能需要任何不同的设置，您可以在 raspberry pi 上搜索虚拟环境，但我记得它很可能像 Ubuntu

Answer 2

有时我忘记激活 virtualenv 时会发生这种情况，即使我可以在没有 virtualenv 的情况下使用 pip 或 pip3 安装新库。但是 python main.py 不会运行。然后我发现我没有开启虚拟环境

Python 重新运行脚本时找不到脚本模块

Python script module not found on rerun of script

python

pip

raspberry-pi

python-venv

adafruit-circuitpython