7.7 Ch 7 Program: Data visualization (Python 3) (1) Prompt the user for a title

Question

7.7 Ch 7 Program: Data visualization (Python 3)

(1) Prompt the user for a title for data. Output the title. (1 pt)

Ex:

(2) Prompt the user for the headers of two columns of a table. Output the column headers. (1 pt)

Ex:

(3) Prompt the user for data points. Data points must be in this format: string, int. Store the information before the comma into a string variable and the information after the comma into an integer. The user will enter -1 when they have finished entering data points. Output the data points. Store the string components of the data points in a list of strings. Store the integer components of the data points in a list of integers. (4 pts)

Ex:

(4) Perform error checking for the data point entries. If any of the following errors occurs, output the appropriate error message and prompt again for a valid data point.

If entry has no comma

Output: Error: No comma in string. (1 pt)

If entry has more than one comma

Output: Error: Too many commas in input. (1 pt)

If entry after the comma is not an integer

Output: Error: Comma not followed by an integer. (2 pts)

Ex:

(5) Output the information in a formatted table. The title is right justified with a minimum field width value of 33. Column 1 has a minimum field width value of 20. Column 2 has a minimum field width value of 23. (3 pts)

Ex:

(6) Output the information as a formatted histogram. Each name is right justified with a minimum field width value of 20. (4 pts)

Ex:

Explanation / Answer

def outputTable(title, header1, header2, strList, intList):
   """
       Function that prints the contents in tabular format
   """
  
   # Printing title
   print(" %33s " %(title));
  
   # Printing header
   print(" %-20s %-10s %-23s " %(header1, "|", header2));
  
   print(" -------------------------------------------- ");
  
   # Printing formatted output
   for i in range(0, len(strList)):
       print(" %-20s %-10s %-23d " %(strList[i], "|", intList[i]));
      
   print(" ");

  
def outputHistogram(strList, intList):
   """
       Function that prints the contents in tabular format
   """
  
   print(" ");
  
   # Printing names
   for i in range(0, len(strList)):
       print(" %20s %-5s " %(strList[i], " "), end = "");
      
       # Printing *'s
       for j in range(0, intList[i]):
           print("*", end="");
      
   print(" ");
  
  
def chkCommas(dataPoint):
   """
       Function that validates commas error checking
   """
  
   # Checking for non-existence of comma
   if ',' not in dataPoint:
       print(' Error: No comma in string. ');
       return False;
  
   # Checking for more than comma  
   elif dataPoint.count(",") > 1:
       print(' Error: Too many commas in input. ');
       return False;
  
   # Checking for integer after comma
   else:
      
       # Fetching integer after comma
       index = dataPoint.find(",");
       name = dataPoint.split(",")[0];
       integer = (dataPoint.split(",")[1]).strip();
      
       # Validating integer
       if not (integer.isdigit()):
           print(' Comma not followed by an integer. ');
           return False;  
       else:
           return True;

def main():
   """
       Main function
   """
  
   # List's to hold data
   strList = [];
   intList = [];
  
   # Reading title from user
   title = input(' Enter a title for the data: ');
   print(" You entered: " + title);
  
   # Reading header1 from user
   header1 = input(' Enter the column 1 header: ');
   print(" You entered: " + header1);
  
   # Reading header2 from user
   header2 = input(' Enter the column 2 header: ');
   print(" You entered: " + header2);
  
   # Reading dataPoints
   dataPoint = input(" Enter a data point (-1 to stop input): ");
  
   # Reading data points
   while dataPoint != "-1":
       # Validating commas
       commas = chkCommas(dataPoint);
      
       # If there commas are OK
       if commas:
           # Splitting data point to name and integer
           name = dataPoint.split(",")[0];
           integer = int((dataPoint.split(",")[1]).strip());
          
           # Printing to console
           print(" Data string: " + name);
           print(" Data integer: " + str(integer));
          
           # Storing in list
           strList.append(name);
           intList.append(integer);
          
       # Reading dataPoints
       dataPoint = input(" Enter a data point (-1 to stop input): ");
  
   # Printing result in tabular format
   outputTable(title, header1, header2, strList, intList);
  
   # Printing result in histogram
   outputHistogram(strList, intList);
  
# Calling main function  
main();

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