Video 1:

cwd = os.getcwd()
data_path = os.path.join(cwd, 'bike-sharing-data', 'data.csv')

line_counter = 0
with open(data_path) as data_file:
	for line in data_file:
		print(line)
		line_counter += 1
		if( line_counter > 9 ):
			break
			
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video 2: Tex processing

line_counter = 0
with open(data_path) as data_file:
	for line in data_file:
		if line_counter == 0:
			pass
		else:
			line_stripped = line.strip()
			fields = line_stripped.split(',')
			dteday = fields[1]
			line_date = datetime.strptime(dteday, '%Y-%m-%d')
		line_counter += 1

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Video 3: text 

line_counter = 0
month_line_count = {}

with open(data_path) as data_file:
	for line in data_file:
		if line_counter == 0:
			pass
		else:
			line_stripped = line.strip()
			fields = line_stripped.split(',')
			dteday = fields[1]
			line_date = datetime.strptime(dteday, '%Y-%m-%d')
			line_month = line_date.month
			if( line_month not in month_line_count ) :
				month_line_count[line_month] = 1
			else:
				month_line_count[line_month] += 1
			
		line_counter += 1
		
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Video 4: text 		

usage_count = fields[-1] // use -1 to get last index

--------
Video 5: text 			
count_threshold = 6000
out_path = os.path.join(cwd, 'bike-sharing-data', f'days_over_{count_threshold}.csv')
line_counter = 0
with open(data_path) as data_file open(out_path, 'w') as out_file:
	for line in data_file:
		if( line_counter == 0 ):
			pass
		else:
			line_stripped = line.strip()
			fields = line_stripped.split(',')
			usage_count = int(fields[-1])
			if( usage_count > count_threshold ):
				out_file.write(line)
				
			line_counter += 1	
			
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Video 6: text			

cwd = os.getcwd()
baby_name_path = os.path.join(cwd, 'baby-names', 'Most_Popular_Baby_Names__1980-2013.csv')		

name_counts = {}
with open (baby_name_path) as name_file:
	name_file.readline() //will skip the first line
	for line in name_file:
		.......
		
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Video 7: text			
		
myFile = open ('name of the file', 'r')
for line in myFile:
	print(line)
myFile.close()	


1980AL09....
lineStrip = line.strip()
year = lineStrip[0:4]

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vIDEO 8: write file
lineList = ['here', 'I', 'am', 'to', 'save', 'the', 'day']
with open('test.txt', 'w') as myFile:
	for line in lineList:
	
		line = ','.join(line) + '\n'
		
		myFile.write(line + '\n')
		
fileToRead = ""		
fileToWrite = ""
with open(fileToRead, 'r') as readFile, open(fileToWrite,'w') as writeFile:
	for line in readFile:
		rank,year,name,count = line.split(',')
		if name === 'William':
			lineToWrite = ','.join[rank, year] + '\n'
			writeFile.write(lineToWrite)
			
file = open('filename.txt', 'r')
try:
    contents = file.read()
    # Process the contents
finally:
    file.close()