How to round off a number to two decimal places?

[QUAH KAH CHUN UPSI]

g=9.81

t=1.5291

T="{:.2f}".format(t)

h="{:.2f}".format(0.5*g*T**2)

print(h)


I want to convert  t into two decimal places before bringing into the formula of free fall. 

[Bruce Sherwood]

What you have done is calculate a string variable T and then tried to use T in a numerical expression, 0.5*g*T**2, which can't work.

If you simply want to change t = 1.5291 into t2 = 1.53, a simple way to do that is t2 = round(100*t).

I'll comment that Python now offers what I think is a much more convenient way to create strings that include numbers. Instead of saying "There are {:.2f} seconds".format(t) you say T = f" There are {t:.2f} seconds ". See

   https://www.glowscript.org/docs/VPythonDocs/text_output.html

Bruce