Execute Python-3 Online

# Python Tutorial for Beginners 5: Dictionaries - Working with Key-Value Pairs

student = {'name':'John','age':25,'courses':['Math','CompSci']}

print(student)
print(student['name'])
print(student['age'])
print(student['courses'])

# print(student['phone']) # error, does not exist

# get method (cleaner)
print(student.get('name'))
print(student.get('phone'))
print(student.get('phone','Not Found'))

student['phone']='555-5555'
print(student.get('phone','Not Found'))

student['name']='Jane'
print(student)

student.update({'name':'Jim','age':26, 'phone':'222-2222'})
print(student)

# del(student['age'])
# print(student)

age = student.pop('age')
print(student)
print(age)

# Loop through keys/values of our dictionary
# First, how many keys in the dict?
print(len(student))
print(student.keys())
print(student.values())
print(student.items())



# Comparisons:
# Equal:            ==
# Not Equal:        !=
# Greater Than:     >
# Less Than:        <
# Greater or Equal: >=
# Less or Equal:    <=
# Object Identity:  is


# False Values:
    # False
    # None
    # Zero of any numeric type
    # Any empty sequence. For example, '', (), [].
    # Any empty mapping. For example, {}.

condition = False

if condition:
    print('Evaluated to True')
else:
    print('Evaluated to False')