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#!/usr/bin/env python3

# Copyright 2014 Brett Slatkin, Pearson Education Inc.

#

# Licensed under the Apache License, Version 2.0 (the "License");

# you may not use this file except in compliance with the License.

# You may obtain a copy of the License at

#

# http://www.apache.org/licenses/LICENSE-2.0

#

# Unless required by applicable law or agreed to in writing, software

# distributed under the License is distributed on an "AS IS" BASIS,

# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

# See the License for the specific language governing permissions and

# limitations under the License.

# Preamble to mimick book environment

import logging

from pprint import pprint

from sys import stdout as STDOUT

# Example 1

def remainder(number, divisor):

return number % divisor

assert remainder(20, 7) == 6

# Example 2

remainder(20, 7)

remainder(20, divisor=7)

remainder(number=20, divisor=7)

remainder(divisor=7, number=20)

# Example 3

try:

# This will not compile

source = """remainder(number=20, 7)"""

eval(source)

except:

logging.exception('Expected')

else:

assert False

# Example 4

try:

remainder(20, number=7)

except:

logging.exception('Expected')

else:

assert False

# Example 5

def flow_rate(weight_diff, time_diff):

return weight_diff / time_diff

weight_diff = 0.5

time_diff = 3

flow = flow_rate(weight_diff, time_diff)

print('%.3f kg per second' % flow)

assert (flow - 0.16666666666666666) < 0.0001

# Example 6

def flow_rate(weight_diff, time_diff, period):

return (weight_diff / time_diff) * period

# Example 7

flow_per_second = flow_rate(weight_diff, time_diff, 1)

assert (flow_per_second - 0.16666666666666666) < 0.0001

# Example 8

def flow_rate(weight_diff, time_diff, period=1):

return (weight_diff / time_diff) * period

# Example 9

flow_per_second = flow_rate(weight_diff, time_diff)

assert (flow_per_second - 0.16666666666666666) < 0.0001

flow_per_hour = flow_rate(weight_diff, time_diff, period=3600)

assert flow_per_hour == 600.0

# Example 10

def flow_rate(weight_diff, time_diff,

period=1, units_per_kg=1):

return ((weight_diff * units_per_kg) / time_diff) * period

# Example 11

pounds_per_hour = flow_rate(weight_diff, time_diff,

period=3600, units_per_kg=2.2)

print(pounds_per_hour)

assert pounds_per_hour == 1320.0

# Example 12

pounds_per_hour = flow_rate(weight_diff, time_diff, 3600, 2.2)

print(pounds_per_hour)

assert pounds_per_hour == 1320.0