Comparison operators

Intermediate Python for Finance

Kennedy Behrman

Data Engineer, Author, Founder

Python comparison operators

Equality: ==,!=
Order: <,>,<=,>=

Equality operator vs assignment

Test equality: ==

Assign value: =

Equality operator vs assignment

13 == 13

True

count = 13
print(count)

Equality comparisons

datetimes
numbers (floats, ints)
dictionaries
strings
almost anything else

Comparing datetimes

date_close_high = datetime(2019, 11, 27)
date_intra_high = datetime(2019, 11, 27)
print(date_close_high == date_intra_high)

True

Comparing dictionaries

d1 = {'high':56.88, 'low':33.22, 'closing':56.88}
d2 = {'high':56.88, 'low':33.22, 'closing':56.88}
print(d1 == d2)

True

d1 = {'high':56.88, 'low':33.22, 'closing':56.88}
d2 = {'high':56.88, 'low':33.22, 'closing':12.89}
print(d1 == d2)

False

Comparing different types

print(3 == 3.0)

True

print(3 == '3')

False

Not equal operator

print(3 != 4)

True

print(3 != 3)

False

Order operators

Less than <
Less than or equal <=
Greater than >
Greater than or equal >=

Less than operator

print(3 < 4)

True

print(3 < 3.6)

True

print('a' < 'b')

True

Less than operator

date_close_high = datetime(2019, 11, 27)
date_intra_high = datetime(2019, 11, 27)
print(date_close_high < date_intra_high)

False

Less than or equal operator

print(1 <= 4)

True

print(1.0 <= 1)

True

print('e' <= 'a')

False

Greater than operator

print(6 > 5)
print(4 > 4)

True

False

Greater than or equal operator

print(6 >= 5)
print(4 >= 4)

True

True

Order comparison across types

print(3.45454 < 90)

True

print('a' < 23)

<hr />----------------------------------------------
TypeError      Traceback (most recent call last)
...
TypeError: '<' not supported between instances of 'str' and 'int'

Let's practice!

Intermediate Python for Finance