Archived:How to read and write settings to a file using PySymbian

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Created: Jan Rune Johansen (18 Aug 2007)

Last edited: hamishwillee (08 May 2013)

This article demonstrates how to read and write from a file, which could be used to create a settings file for your application, for example.

# Easily read and write variables from file.
import codecs
 
path = "E:\\Python\\demo.ini"
newline = "\n"
 
def init_settings():
	f = codecs.open(path, 'w', 'utf_8')
	settings  = "variable_1" + newline
	settings += "variable_2" + newline
	settings += "variable_3" + newline
	f.write(settings)
	f.close()
 
init_settings()
 
def read_settings_array():
	f = codecs.open(path, 'r', 'utf8')
	settingsfile = f.read()
	settings = settingsfile.split("\n");
	f.close()
	return settings
 
print read_settings_array()  # <- whole array, or... 
 
 
def write_setting(data,index):
	settings = read_settings_array()
	newarray=""
	for i in range(len(settings)):
		if i == index:
			settings[i] = data
		newarray += settings[i] + "\n"
	f = codecs.open(path, 'w', 'utf_8')
	f.write(newarray)
	f.close()
 
write_setting("FOO",2)			# <- Update index as you like
 
print read_settings_array()[2]  #... get em by index
 
#To write at the end of the text that is already in a file, we open it in "append" mode
f=codecs.open(path, 'a', 'utf_8')
f.write("This line will be at the end of the existing text")
f.close()