string_methods.md

String methods

Exercise 1

Determine what the expressions do to the string in the center.

Exercise 2

The following program identifies names used for both girls and boys and writes them to a file.

Complete the code to dissect lines to columns, so that the variables name and gender are defined.

girls = []
duplicates = []

for line in open('names/yob2015.txt'):

    # insert your code here

    if gender == 'F':
       girls.append(name)
    elif gender == 'M':
       if name in girls:
           duplicates.append(name)

output = open('duplicate_names.txt', 'w')
for name in duplicates:
    text = "{:>15s}\n".format(name)
    output.write(text)
output.close()

Format Strings

Exercise 3

Try the following expressions in a Python shell:

"{}".format("Hello")
"{:10}".format("Hello")
"{:>10}".format("Hello")
"{1} {0}".format("first", "second")
"{:5d}".format(42)
"{:4.1f}".format(3.14159)
"{:6.3f}".format(3.14159)

Exercise 4

You have the following two lists:

top_ten_names = ['Jacob', 'Michael', 'Matthew', 'Joshua', \
    'Christopher', 'Nicholas', 'Andrew', 'Joseph', \
    'Daniel', 'Tyler']

top_ten_numbers = [34465, 32025, 28569, 27531, \
    24928, 23632, 22818, 22307, 21500]

Write a program that creates a table with two vertically aligned columns.

Exercise 5

Write a for loop producing the following string:

000111222333444555666777888999