This cMath Module lesson is for a beginner. Read the short notes, run each example, then change one name or number and run it again.
cmath is math for complex numbers. A complex value has a real part and an imaginary part.
math.sqrt rejects a negative number. cmath.sqrt returns an imaginary result.
Example 1: Start here
The result is 1j, which is the square root of -1.
import cmath # load a tool that comes with Python
print(cmath.sqrt(-1))
Example 2: Store the idea in a name
cMath Module begins with a value you can point at. The name topic holds that text.
topic = "cMath Module" # text
print(topic)
Example 3: Check it with if
An if chooses one branch. Change the score and run it again to see the other message.
score = 16 # a whole number
if score >= 80: # run the indented lines only when this is true
print("Pass")
else: # runs when the test above was false
print("Try again")
Example 4: Repeat with a loop
A for loop runs the indented line once per step. The numbers 1, 2, and 3 are printed on their own lines.
for step in range(1, 4): # repeat once per number; range stops before the last
print("Step", step) # a comma prints each value, with a space between
The result is 1j, which is the square root of -1.
