π in python is the math.pi variable. It is included in the standard library, and before you try to calculate it yourself, you should first import the math library and call the math.pi method.
Related recommendations: "Python Basic Tutorial"
Let us look at a very straightforward method of calculating Pi. Taking Python 2.7 as an example, the code is as follows:
import sys
import math
defmain(argv):
if len(argv) !=1:
sys.exit('Usage: calc_pi.py <n>')
print'\nComputing Pi v.01\n'
a=1.0
b=1.0/math.sqrt(2)
t=1.0/4.0
p=1.0
for i in range(int(sys.argv[1])):
at=(a+b)/2
bt=math.sqrt(a*b)
tt=t-p*(a-at)**2
pt=2*p
a=at;b=bt;t=tt;p=pt
my_pi=(a+b)**2/(4*t)
accuracy=100*(math.pi-my_pi)/my_pi
print"Pi is approximately: "+str(my_pi)
print"Accuracy with math.pi: "+str(accuracy)
if__name__=="__main__":
main(sys.argv[1:])The above is the detailed content of How to enter π in python. For more information, please follow other related articles on the PHP Chinese website!
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