atan2() function in Python

atan2(y, x) returns value of atan(y/x) in radians. The atan2() method returns a numeric value between - and representing the angle of a (x, y) point and positive x-axis. Syntax :

atan2(y, x)

Parameter :

(y, x) - Both must be a numeric value.

Returns :

Returns atan(y / x), in radians.
The double value is  from polar coordinate (r, theta). 

TypeError :

Returns a TypeError if anything other than float is passed. 

  Code #1 : Output :

atan2(-0.5, -0.5): -2.356194490192345
atan2(1.2, 1.5): 0.6747409422235526
atan2(1.2, -1.5): 2.4668517113662407

  Code #2 : Output :

0.16514867741462683
0.5880026035475675
0.40489178628508343
0.4636476090008061

  Code #3 : Program demonstrating the error Output :

Traceback (most recent call last):
 File "/home/622586ab389561bcdbfff258aca01e65.py", line 9, in 
 theta = math.atan2([y],[x]) 
TypeError: a float is required

  Practical Application : This function is used to find the slope in radians when Y and X co-ordinates are given. Code #4 :

Output :

0.7853981633974483