Code from chapter 5 Video

Here is the console interactive session

Python 3.6.0 (v3.6.0:41df79263a11, Dec 23 2016, 08:06:12) [MSC v.1900 64 bit (AMD64)] on win32
Type "copyright", "credits" or "license()" for more information.
>>> #Chapter 5 take IV
>>> #strings
>>> #lists of characters
>>> greeting="Hello"
>>> type(greeting)
<class 'str'>
>>> number='17'
>>> type(number)
<class 'str'>
>>> print[greeting[0])
SyntaxError: invalid syntax
>>> print(greeting[0])
H
>>> print(greeting[4])
o
>>> print(greeting[2:3])
l
>>> print(greeting[2:4})
SyntaxError: invalid syntax
>>> print(greeting[2:4])
ll
>>> print(greeting[:4])
Hell
>>> len(greeting)
5
>>> for ch in greeting:
 print(ch)

H
e
l
l
o
>>> 
====== RESTART: C:/Users/SteveConger/Documents/PythonFiles/username.py ======
This program generates user names
enter your first name: Steve
enter your last name: Conger
Your user name is SConger
>>> 
====== RESTART: C:/Users/SteveConger/Documents/PythonFiles/username.py ======
This program generates user names
enter your first name: Steve
enter your last name: Robertson
Your user name is sroberts
>>> #page 148 string functons
>>> ord(a)
Traceback (most recent call last):
  File "<pyshell#19>", line 1, in <module>
    ord(a)
NameError: name 'a' is not defined
>>> ord("a")
97
>>> ord("A")
65
>>> chr(97)
'a'
>>> weekdays=["Mon", "Tue", "Wed", "Thu", "Fri", "Sat", "Sun"]
>>> print(weekdays[3])
Thu
>>> print(weekends[3-1])
Traceback (most recent call last):
  File "<pyshell#25>", line 1, in <module>
    print(weekends[3-1])
NameError: name 'weekends' is not defined
>>> print (weekdays[3-1])
Wed
>>> num=1234.33939020229202
>>> print("the formatted value = {0000.2f}".format(num))
Traceback (most recent call last):
  File "<pyshell#28>", line 1, in <module>
    print("the formatted value = {0000.2f}".format(num))
AttributeError: 'float' object has no attribute '2f'
>>> print("the formatted value={0:0.2f}".format(num))
the formatted value=1234.34
>>> print("The formatted value=${0.0.2f}".format(num))
Traceback (most recent call last):
  File "<pyshell#30>", line 1, in <module>
    print("The formatted value=${0.0.2f}".format(num))
AttributeError: 'float' object has no attribute '0'
>>> print("the formatted value=${0:0.2f}",format(num))
the formatted value=${0:0.2f} 1234.339390202292
>>> print("the formatted value=${0:0.2f}".format(num))
the formatted value=$1234.34
>>> 
====== RESTART: C:/Users/SteveConger/Documents/PythonFiles/userfile.py ======
this program creates a file of usernames in batch mode
from a file of names
Enter the file name with the names: name.txt
Enter the name of the output file: unames.txt
Traceback (most recent call last):
  File "C:/Users/SteveConger/Documents/PythonFiles/userfile.py", line 26, in <module>
    main()
  File "C:/Users/SteveConger/Documents/PythonFiles/userfile.py", line 12, in main
    infile=open(infileName, "r")
FileNotFoundError: [Errno 2] No such file or directory: 'name.txt'
>>> 
====== RESTART: C:/Users/SteveConger/Documents/PythonFiles/userfile.py ======
this program creates a file of usernames in batch mode
from a file of names
Enter the file name with the names: names.txt
Enter the name of the output file: unames.txt
Traceback (most recent call last):
  File "C:/Users/SteveConger/Documents/PythonFiles/userfile.py", line 26, in <module>
    main()
  File "C:/Users/SteveConger/Documents/PythonFiles/userfile.py", line 19, in main
    print(username, file=outfile)
NameError: name 'outfile' is not defined
>>> 
====== RESTART: C:/Users/SteveConger/Documents/PythonFiles/userfile.py ======
this program creates a file of usernames in batch mode
from a file of names
Enter the file name with the names: names.txt
Enter the name of the output file: unames.txt
the user names have been written to unames.txt
>>> 

Here is the first version of the Username program

#username.py
#Steve Conger
#10/8/2019

def main():
    print("This program generates user names")

    #get user first and last names
    first=input("enter your first name: ")
    last=input("enter your last name: ")

    #concatinate user name first letter of first name
    #first 7 letters of the last name
    username=first[0] + last[:7]
    print("Your user name is",username.lower())

main()

Here is the file version

#create a file of usernames
#read the file

def main():
    print("this program creates a file of usernames in batch mode")
    print("from a file of names")

    # get file names
    infileName=input("Enter the file name with the names: ")
    outfileName=input("Enter the name of the output file: ")

    infile=open(infileName, "r")
    outfile=open(outfileName, "w")

    # loop through the file, process and write
    for line in infile:
        first, last = line.split()
        username=(first[0] + last[:7]).lower()
        print(username, file=outfile)

    infile.close()
    outfile.close()

    print ("the user names have been written to", outfileName)

main()