In [1]:

    

d = {'k1': 1, 'k2': 2, 'k3': 3}

d['k10'] = d['k1']
del d['k1']

print(d)


    

    




{'k2': 2, 'k3': 3, 'k10': 1}

In [2]:

    

d = {'k1': 1, 'k2': 2, 'k3': 3}

print(d.pop('k1'))


    

    




1

In [3]:

    

print(d)


    

    




{'k2': 2, 'k3': 3}

In [4]:

    

d = {'k1': 1, 'k2': 2, 'k3': 3}

d['k10'] = d.pop('k1')

print(d)


    

    




{'k2': 2, 'k3': 3, 'k10': 1}

In [5]:

    

d = {'k1': 1, 'k2': 2, 'k3': 3}

# print(d.pop('k10'))
# KeyError: 'k10'


    

In [6]:

    

print(d.pop('k10', None))


    

    




None

In [7]:

    

print(d)


    

    




{'k1': 1, 'k2': 2, 'k3': 3}

In [8]:

    

def change_dict_key(d, old_key, new_key, default_value=None):
    d[new_key] = d.pop(old_key, default_value)


    

In [9]:

    

d = {'k1': 1, 'k2': 2, 'k3': 3}
change_dict_key(d, 'k1', 'k10')
print(d)


    

    




{'k2': 2, 'k3': 3, 'k10': 1}

In [10]:

    

d = {'k1': 1, 'k2': 2, 'k3': 3}
change_dict_key(d, 'k10', 'k100')
print(d)


    

    




{'k1': 1, 'k2': 2, 'k3': 3, 'k100': None}

In [11]:

    

d = {'k1': 1, 'k2': 2, 'k3': 3}
change_dict_key(d, 'k10', 'k100', 100)
print(d)


    

    




{'k1': 1, 'k2': 2, 'k3': 3, 'k100': 100}

In [12]:

    

d = {'k1': 1, 'k2': 2, 'k3': 3}
change_dict_key(d, 'k1', 'k2')
print(d)


    

    




{'k2': 1, 'k3': 3}

In [13]:

    

def change_dict_key_setdefault(d, old_key, new_key, default_value=None):
    d.setdefault(new_key, d.pop(old_key, default_value))


    

In [14]:

    

d = {'k1': 1, 'k2': 2, 'k3': 3}
change_dict_key_setdefault(d, 'k1', 'k2')
print(d)


    

    




{'k2': 2, 'k3': 3}

In [15]:

    

d = {'k1': 1, 'k2': 2, 'k3': 3}
change_dict_key_setdefault(d, 'k1', 'k10')
print(d)


    

    




{'k2': 2, 'k3': 3, 'k10': 1}

In [16]:

    

d = {'k1': 1, 'k2': 2, 'k3': 3}
change_dict_key_setdefault(d, 'k10', 'k100')
print(d)


    

    




{'k1': 1, 'k2': 2, 'k3': 3, 'k100': None}

In [17]:

    

def change_dict_key_exist(d, old_key, new_key):
    if old_key in d:
        d[new_key] = d.pop(old_key)


    

In [18]:

    

d = {'k1': 1, 'k2': 2, 'k3': 3}
change_dict_key_exist(d, 'k1', 'k10')
print(d)


    

    




{'k2': 2, 'k3': 3, 'k10': 1}

In [19]:

    

d = {'k1': 1, 'k2': 2, 'k3': 3}
change_dict_key_exist(d, 'k10', 'k100')
print(d)


    

    




{'k1': 1, 'k2': 2, 'k3': 3}

In [20]:

    

d = {'k1': 1, 'k2': 2, 'k3': 3}
change_dict_key_exist(d, 'k1', 'k2')
print(d)


    

    




{'k2': 1, 'k3': 3}

In [21]:

    

def change_dict_key_exist_setdefault(d, old_key, new_key):
    if old_key in d:
        d.setdefault(new_key, d.pop(old_key))


    

In [22]:

    

d = {'k1': 1, 'k2': 2, 'k3': 3}
change_dict_key_exist_setdefault(d, 'k1', 'k2')
print(d)


    

    




{'k2': 2, 'k3': 3}