Strings

# This program demonstrates string functions.


def main():
    string = "Hello"

    print("string: " + string)
    print("string.lower(): " + string.lower())
    print("string.upper(): " + string.upper())
    print("string.find('e'): " + str(string.find('e')))
    print("len(string): " + str(len(string)))
    print("string.replace('H', 'j'): " + string.replace('H', 'j')) 
    print("string[::-1]: " + string[::-1])
    print("string[2:4]: " + string[2:4])
    print("string.strip('H'): " + string.strip('H'))

    name = "Bob"
    value = 123.456
    print("string.format(): {0} earned ${1:.2f}".format(name, value))


main()

Output

string: Hello
string.lower(): hello
string.upper(): HELLO
string.find('e'): 1
len(string): 5
string.replace('H', 'j'): jello
string[::-1]: olleH
string[2:4]: ll
string.strip('H'): ello
string.format(): Bob earned $123.46

Files

# This program demonstrates reading a text file with exception handling.
#
# References:
#     https://en.wikibooks.org/wiki/Python_Programming


def read_file(filename):
    try:
        with open(filename, "r") as file:
            for line in file:
                line = line.strip()
                print(line)
    except Exception as exception:
        print(exception)


def main():
    filename = "temperature.txt"
    read_file(filename)


main()

Output

Celsius,Fahrenheit
0,32
10,50
20,68
...
80,176
90,194
100,212

References

• Wikiversity: Computer Programming