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It took a few days for the command line to figure out this stuff.
After opening Python, there are three command windows: pycharm (python GUI), python (comand line), Module Docs.
Module Docs is a search box for functions that are not known in python.
Comparing IDLE and the command line: both are interactive modes
IDLE (python GUI):
White window. There are code highlighting, automatic indentation, code hints and menu bar;
You can create a new python file, you can copy and paste the code, but the result will not be returned;
The previous command cannot be repeated with the up arrow, and delete cannot be selected.
python(comand line):
A black window will only report an error message after execution.
There is no menu bar, you can only type commands line by line, and paste a piece of code will be disassembled into command execution one by one;
If you cannot paste the tabs and spaces after for, an error will be reported.
Use the up arrow to reproduce the previous command, which is faster, and you can select the current editing line code to delete it directly.
Double-click to run the file: If you want to get rid of the script mode and directly write the code to run, first add the python installation location to the environment variable path. You can then double-click to open the .py file. The solution to the crash: add raw_input() or input() at the end of the .py file according to the version.
There are two ways to run a .py file from the command line:
cmd: switch to the path where the file is located, execute: python myName.py
python.exe:
import os
os.chdir('current path')//Switch to the current path
os.getcwd()//Get the current path
Run: execfile('myName.py')
Or directly: execfile (whole pathname + filename)
If you use import myName.py, you can only return the execution result when you import it for the first time, and an error will be reported when you import it again.
if attrvalue == value:
selection.append(o)
ce.setSelection(selection)
Then call the function in the main function:
if __name__ == '__main__':
selectByAttribute(\"connectionStart\",\"JUNCTION\")
(The meaning of the above code is to select all elements whose value is JUNCTION in the connectionStart attribute in the scene)
After writing the code, click Save, and then press F9 to run this code,
You can also specify the path of the script in the Python console, import the script, and then call the myHelper you just wrote in the console, and fill in the required parameters. The command is as follows:
>>> sys.path.append(ce.toFSPath(\"scripts\"))
>>> import myHelper
>>> myHelpers.selectByAttribute(\"connectionEnd\", \"CROSSING\")
At this time, the element whose value is CROSSING in the connectionEnd attribute is selected.
*Add a startup script
Create a new startup.py script in the CityEngine workspace, and add the following statement to this script so that the myHelper script you just wrote can be loaded when CityEngine starts.
import sys
sys.path.append({PATH_TO_YOUR_SCRIPTS_DIRECTORY})
# eg sys.path.append(\"C:\\user\\CityEngine\\MyProject\\scripts\\")
import myHelper
The next time CityEngine starts, myHelper will be loaded automatically, and the selection function can be used in the Python console in the following way:
>>> startup.myHelpers.selectByAttribute(\"connectionEnd\", \"JUNCTION\")
startup.py will only be loaded when CityEngine starts, so after modifying this script, you need to restart CityEngine.
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