14_for_else_loop.py

#======================================================================================
#                               FOR ELSE LOOP
#--------------------------------------------------------------------------------------
# In python, a for loop can have an else block.
# Use else with loops only when there's a break.
# The else part runs only if the loop finishes normally.
# The else part does not run if the loop is stopped by a break
#=====================================================================================

items = [ 1, 3, 4, 7, 9]
for i in items:
    print(i)
else: 
    print("Loop completed successfully")

items = [ 1, 3, 4, 7, 9]
for i in items:
    if i % 2 == 0:
        print("Even number found",i)
        break
else: 
    print("All numbers are odd")

#--------------------------------------------------------------------------------------
# Real world use cases
#--------------------------------------------------------------------------------------
# check for missing names in a list
names = ["jack", "grace", "alex", None, "jane"]
for name in names:
    if name is None:
        print("Found a missing name")
        break
else:
    print("All names are available")

# check if all files are csv files
files = ["sales.csv", "customers.csv", "employees.csv", "report.csv"]
for file in files:
    if not file.endswith(".csv"):
        print("Not all files are csv files")
        break
else:
    print("All files are csv")

#--------------------------------------------------------------------------------------
# python challenge
#--------------------------------------------------------------------------------------
# check whether any filename appears more than once
file_list = [ "report.csv", "data.xlsx", "summary.docx", "report.csv", "data.csv"]
for file in file_list:
    if file_list.count(file) > 1:
        print("Duplicate file found")
        break
else:
    print("All files are unique")