name = "John"
fav_color = 0x003366
body_temp = 98.65
fav_number = 123
print("name:%s color:%06x temp:%2.1f num:%d" % (name,fav_color,body_temp,fav_number))
# 'name:John color:ff3366 temp:98.6 num:123'
Formatting strings with f-strings
(This doesn't work on 'small' CircuitPythons like QTPy M0 due to the small amounts of flash memory on the board.)
name = "John"
fav_color = 0xff3366
body_temp = 98.65
fav_number = 123
print(f"name:{name} color:{fav_color:06x} temp:{body_temp:2.1f} num:{fav_number}")
# 'name:John color:ff3366 temp:98.6 num:123'
# my_config.py
config = {
"username": "Grogu Djarin",
"password": "ig88rules",
"secret_key": "3a3d9bfaf05835df69713c470427fe35"
}
# code.py
from my_config import config
print("secret:", config['secret_key'])
# 'secret: 3a3d9bfaf05835df69713c470427fe35'
Run different code.py on startup
Use microcontroller.nvm to store persistent state across resets or between boot.py and code.py, and declare that the first byte of nvm will be the startup_mode. Now if you create multiple code.py files (say) code1.py, code2.py, etc. you can switch between them based on startup_mode.
import time
import microcontroller
startup_mode = microcontroller.nvm[0]
if startup_mode == 1:
import code1 # runs code in `code1.py`
if startup_mode == 2:
import code2 # runs code in `code2.py`
# otherwise runs 'code.py`
while True:
print("main code.py")
time.sleep(1)
Note: in CircuitPyton 7+ you can use supervisor.set_next_code_file() to change which .py file is run on startup. This changes only what happens on reload, not hardware reset or powerup. Using it would look like:
import supervisor
supervisor.set_next_code_file('code_awesome.py')
# and then if you want to run it now, trigger a reload
supervisor.reload()
Page last edited May 15, 2024
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