jimjilbang4.py

# Lists

numbers = [3, 5, 7, 4, 2]

## Don't worry about remembering the syntax, as long as you can refer back to an example.

print(numbers)

print(max(numbers))

print(len(numbers))

## Lists can contain anything - even other lists!

fruits = ['Apple', 'Pear', 'Orange', 'Banana']

print(fruits)

# 'for' loops

for fruit in fruits:
    print(fruit)

## In the above, the word 'fruit' is just a new variable. We could use anything:

for x in fruits:
	print(x)

for vegetable in fruits:
	print(vegetable)
	
## But it's best to use 'fruit' here because that's what they are!

# Example: Given a list of release codes, present them as release titles:

release_codes = ['142', '143', '144', '151', '152', '153', '154', '161', '162', '163']

## For '142', we want to print 'Release F142', and so on

for release_code in release_codes:
    print('Release F' + release_code)

# Challenge 1: Given the below list of software package numbers, print out just those packages over 30000

software_packages = [27588, 30556, 28321, 30322, 26019, 30028, 25236]

## Hint - Recall how we used 'if' statements before to make decisions.

# Andrew Westwood:

for SP in software_packages:
	if SP > 30000:
		print(SP)
	
# We can also use 'for comprehensions' to create new lists from old lists.
# In this example, we create a new list of just those SPs with numbers over 30000.

# First we define a function to use as our condition.
def over_30000(sp):
    if sp > 30000
        return True
    else:
        return False

# Then we can put the whole 'for comprehension' on one line:
release_software_packages = [software_package for software_package in software_packages if over_30000(software_package)]
## Read this as "Give me the software package for each software package in the software packages list, but only if the software package is over 30000".
## For-comprehensions are tricky stuff and we can usually use a for loop instead, so don't get too bogged down in remembering this.

# Modules

## Programming languages don't include everything as standard - There'd be too much going on!
## If we want to use file system operations, we need to import a module to do it.

import os # This says: For the rest of this program or script, make the 'os' module available

current_working_directory = os.getcwd()

# Two things to notice here:
## The . between os and getcwd() tells us that getcwd() belongs to the 'os' module
## The brackets after getcwd are for an empty set of parameters. 'getcwd' is a function!

print(current_working_directory)

# Challenge 2: Print a list of the files and folders in the current directory.

## The online documentation for the os module includes this information on listdir:

## os.listdir(path)
## Return a list containing the names of the entries in the directory given by path. The list is in arbitrary order.
## It does not include the special entries '.' and '..' even if they are present in the directory.

# Sonal & Marc

listdir = os.listdir(current_working_directory)

for list in listdir:
	print(list)

## The docs for most modules can be found by Googling for them and the word 'python'. Here's the documentation for the os module:
## https://docs.python.org/2/library/os.html