How to Use Global Variable in Python

The following is the example telling us how to define and use global variable in python.

global cnt
cnt = 0

def addCnt():
	global cnt
	cnt += 1
	print("cnt in addCnt= ", cnt)

def subCnt():
	global cnt
	cnt *= 4
	print("cnt in subCnt = " + str(cnt))

def printCnt():
	global cnt
	print("cnt in printCnt= ", cnt)

if __name__ == '__main__':
	#Global variables in main function don't need to add global key word.
	cnt = 10
	addCnt()
	subCnt()
	printCnt()

Note:

In main function, we don’t need to add global key word. otherwise, we will get a warning.

The following are some Python Usage Examples. You can access it to get more details.

Python Files and Directories Operation

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