Python small exercise --- write a function that accepts an int parameter, judge whether the parameter is a prime number, and return a Boolean value.

The function determines whether a parameter is a prime number

Boolean values refer to True and False
The python range() function can create a list of integers, generally used in a for loop

#number1 is the function name, def defines a function, a is the parameter required by the function, which is a local variable
#A prime number is a natural number that can only be divisible by 1 and itself, except for 0 and 1
def number1(a):
  if a < 2:
	return False
  elif a == 2:
	return True
  else:
	for i in range(2, a):
		if a % i == 0:
			return False
		else:
			return True
#Need to use input to get a parameter, and it is of type int
a = int(raw_input("please input your number:"))
#The function name is defined as number1, number1(a) can get the result, but you need to add print to output the result
print number1(a)

Boolean values refer to True and False

The python range() function can create a list of integers, generally used in a for loop

range(start, stop[, step]);
start: The counting starts from start. The default is to start from 0. For example, range(5) is equivalent to range(0, 5);
stop: Count to the end of stop, but stop is not included. For example: range(0, 5) is [0, 1, 2, 3, 4] without 5
step: step length, the default is 1. For example: range(0, 5) is equivalent to range(0, 5, 1)

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