def write_file(file_path):
"""Requests a series of numerical inputs and writes them to the file.
Arguments:
file_path(basestring): The path to the file
"""
if os.path.isfile(file_path):
should_overwrite = io.yes_no_prompt('File {} exists. Overwrite?')
# If the file shouldn't be overwritten, abort
if not should_overwrite:
return
total_num_entries = io.get_and_confirm_input(
'How many numbers will you enter: ')
total_num_entries = int(total_num_entries)
num_entries_given = 0
with open(file_path, 'w') as wfile:
while num_entries_given < total_num_entries:
value = io.get_and_confirm_input(
'Entry #{}: '.format(num_entries_given + 1))
value = float(value)
wfile.write('{}\n'.format(value))
num_entries_given += 1
def execute(self, maximum_list_length):
"""Prompt user for a file and have them enter values to write into it.
Arguments:
maximum_list_length(int): The maximum allowed list length.
"""
output_file = io.prompt_valid_file_name(
'Please enter the file to write: ')
if os.path.isfile(output_file):
self.prompt_overwrite_or_change(output_file, maximum_list_length)
if not os.path.exists(os.path.dirname(output_file)):
self.directory_does_not_exist(output_file, maximum_list_length)
total_num_entries = int(io.get_and_confirm_input(
'How many numbers will you enter: '))
num_entries_given = 0
entries = []
while num_entries_given < total_num_entries:
value = io.get_and_confirm_list(
'Entry {}: '.format(num_entries_given + 1),
max_list_length=maximum_list_length)
entries.append(value)
num_entries_given += 1
io.write_lists_to_file(output_file, entries)
print 'Results written to {}'.format(output_file)
def main():
"""The application entry point"""
print 'EXERCISE 1A'
print '==========='
print 'This program takes a CSV file, asks you to select a row from that'
print 'file, and then computes the mean and standard deviation of the'
print 'values in that row.'
print
file_path = io.get_and_confirm_input('Enter csv file with values: ')
data = io.read_csv_file(file_path)
if not data:
raise RuntimeError('No data found in file {}'.format(file_path))
column = io.choose_from_list(
'Which column would you like to use:', data[0].keys())
if column not in data[0]:
raise RuntimeError('Invalid column {}'.format(column))
values = linked_list.LinkedList()
for each in data:
values.insert(each[column])
for each in values:
print each
print 'Mean: ', statistics.mean(values)
print 'Std Dev: ', statistics.standard_deviation(values)
def main():
"""Application entry point"""
print "Exercise 1B"
print "==========="
print "This program allows you to write or read a file containing floating"
print "point values."
print
read_write = io.binary_choice("Mode ((r)ead/(w)rite): ", "r", "w")
file_path = io.get_and_confirm_input("Please enter a file name: ")
if read_write == "r":
read_file(file_path)
else:
write_file(file_path)
def prompt_for_output_file(original_file_name):
"""Prompt for the file to output data into
Arguments:
original_file_name(str): The original file name.
Returns:
str: The new file name if a new file is entered, otherwise the original
file name.
"""
print "Origin file: {}".format(original_file_name)
choice = io.binary_choice("Output file (s)ame/(n)ew file? ", "s", "n")
if choice == "n":
new_file_name = io.get_and_confirm_input("New file name: ")
return new_file_name
return original_file_name
def prompt_for_output_file(original_file_name):
"""Prompt for the file to output data into
Arguments:
original_file_name(str): The original file name.
Returns:
str: The new file name if a new file is entered, otherwise the original
file name.
"""
print 'Origin file: {}'.format(original_file_name)
choice = io.binary_choice('Output file (s)ame/(n)ew file? ', 's', 'n')
if choice == 'n':
new_file_name = io.get_and_confirm_input('New file name: ')
return new_file_name
return original_file_name
def modify_file(file_path):
"""Modifies the values in the given file.
Arguments:
file_path(str): A file to be modified
"""
numbers = io.read_numbers_from_file(file_path)
output_file = prompt_for_output_file(file_path)
# Go through each number one at a time
results = []
for idx, each in enumerate(numbers):
# Display the results up to this point
if results:
print 'Numbers So Far:'
for num in results:
print num
# Otherwise display next number
print 'Next Number:'
print each
# Let the user choose what to do with the number
choice = io.choose_from_list(
'What would you like to do',
['Keep', 'Modify', 'Delete', 'Keep Rest']
)
choice = choice.lower()
if choice == 'keep':
results.append(each)
elif choice == 'modify':
number = io.get_and_confirm_input("New value: ")
results.append(float(number))
elif choice == 'keep rest':
results += numbers[idx:]
break
elif choice == 'delete':
# Do nothing
pass
# Write the updated numbers to the output file
io.write_numbers_to_file(output_file, results)
print 'Results written to ', output_file
def main():
"""Application entry point"""
print "This program will read or write numbers to or from a given file."
file_path = io.get_and_confirm_input("Please enter a file name: ")
print "Read - Read and display numbers in a file"
print "Write - Input numbers to write to a file"
print "Add - Go through file line-by-line and add new numbers"
print "Modify - Go through file line by line and modify numbers"
mode = io.choose_from_list("Choose a mode", ["Read", "Write", "Add", "Modify"])
mode = mode.lower()
if mode == "read":
read_file(file_path)
elif mode == "write":
write_file(file_path)
elif mode == "add":
add_file(file_path)
elif mode == "modify":
modify_file(file_path)
else:
raise RuntimeError("Invalid option {}".format(mode))
def main():
"""Application entry point"""
print "This program will read or write numbers to or from a given file."
file_path = io.get_and_confirm_input('Please enter a file name: ')
print 'Read - Read and display numbers in a file'
print 'Write - Input numbers to write to a file'
print 'Add - Go through file line-by-line and add new numbers'
print 'Modify - Go through file line by line and modify numbers'
mode = io.choose_from_list('Choose a mode', ['Read', 'Write', 'Add', 'Modify'])
mode = mode.lower()
if mode == 'read':
read_file(file_path)
elif mode == 'write':
write_file(file_path)
elif mode == 'add':
add_file(file_path)
elif mode == 'modify':
modify_file(file_path)
else:
raise RuntimeError('Invalid option {}'.format(mode))
def add_file(file_path):
"""Go through file line-by-line and ask for additions after given line.
Arguments:
file_path(str): The path to the file
"""
numbers = io.read_numbers_from_file(file_path)
output_file = prompt_for_output_file(file_path)
# Go through each number one at a time
results = []
for idx, each in enumerate(numbers):
# Display the results up to this point
if results:
print 'Numbers So Far:'
for num in results:
print num
print 'Next number:'
print each
# Get the choice
choice = io.choose_from_list('What would you like to do:', ['Keep', 'Add Number After', 'Keep Rest'])
choice = choice.lower()
if choice == 'keep':
results.append(each)
elif choice == 'add number after':
# Get the new number and add it to the list
results.append(each)
number = io.get_and_confirm_input("New number: ")
results.append(float(number))
elif choice == 'keep rest':
# Add remaining numbers to results and exit loop
results += numbers[idx:]
break
# Write the updated numbers to the output file
io.write_numbers_to_file(output_file, results)
print 'Results written to', output_file
def write_file(file_path):
"""Requests a series of numerical inputs and writes them to the file.
Arguments:
file_path(basestring): The path to the file
"""
if os.path.isfile(file_path):
should_overwrite = io.yes_no_prompt(
'File {} exists. Overwrite?'.format(file_path))
# If the file shouldn't be overwritten, abort
if not should_overwrite:
enter_different_file = io.yes_no_prompt(
'Would you like to enter a different file name?')
if enter_different_file:
file_path = io.prompt_valid_file_name('New file name: ')
write_file(file_path)
sys.exit('Aborting. Not overwriting existing file.')
if not os.path.exists(os.path.dirname(file_path)):
print 'ERROR: Directory for file {} does not exist'.format(file_path)
io.prompt_try_again_or_abort()
file_path = io.prompt_valid_file_name('New file name: ')
write_file(file_path)
total_num_entries = io.get_and_confirm_input(
'How many numbers will you enter: ')
total_num_entries = int(total_num_entries)
num_entries_given = 0
with open(file_path, 'w') as wfile:
while num_entries_given < total_num_entries:
value = io.get_and_confirm_float(
'Entry #{}: '.format(num_entries_given + 1))
value = float(value)
wfile.write('{}\n'.format(value))
num_entries_given += 1