For key value in list python

In Python, to iterate the dictionary [dict] with a for loop, use keys[], values[], items[] methods. You can also get a list of all keys and values in the dictionary with those methods and list[].

• Iterate keys in dictionary [dict]: keys[]
• Iterate values in dictionary [dict]: values[]
• Iterate key-value pairs in dictionary [dict]: items[]

Use the following dictionary as an example.

d = {'key1': 1, 'key2': 2, 'key3': 3}

You can iterate keys by using the dictionary object directly in a for loop.

for k in d:
    print[k]
# key1
# key2
# key3

Iterate keys in dictionary [dict]: keys[]

As mentioned above, you can iterate keys by using the dictionary object directly, but you can also use keys[]. The result is the same, but keys[] may clarify the intent to the reader of the code.

for k in d.keys[]:
    print[k]
# key1
# key2
# key3

The keys[] method returns dict_keys. It can be converted to a list with list[].

keys = d.keys[]
print[keys]
print[type[keys]]
# dict_keys[['key1', 'key2', 'key3']]
# 

k_list = list[d.keys[]]
print[k_list]
print[type[k_list]]
# ['key1', 'key2', 'key3']
# 

You can use dict_keys to perform set operations. See the following article for details.

• Set operations on multiple dictionary keys in Python

Iterate values in dictionary [dict]: values[]

You can iterate values in the dictionary with the values[] method.

for v in d.values[]:
    print[v]
# 1
# 2
# 3

The values[] method returns dict_values. It can be converted to a list with list[].

values = d.values[]
print[values]
print[type[values]]
# dict_values[[1, 2, 3]]
# 

v_list = list[d.values[]]
print[v_list]
print[type[v_list]]
# [1, 2, 3]
# 

Iterate key-value pairs in dictionary [dict]: items[]

You can iterate key-value pairs in the dictionary with the items[] method.

for k, v in d.items[]:
    print[k, v]
# key1 1
# key2 2
# key3 3

It can also be received as a tuple of [key, value].

for t in d.items[]:
    print[t]
    print[type[t]]
    print[t[0]]
    print[t[1]]
    print['---']
# ['key1', 1]
# 
# key1
# 1
# ---
# ['key2', 2]
# 
# key2
# 2
# ---
# ['key3', 3]
# 
# key3
# 3
# ---

The items[] method returns dict_items. It can be converted to a list with list[].

items = d.items[]
print[items]
print[type[items]]
# dict_items[[['key1', 1], ['key2', 2], ['key3', 3]]]
# 

i_list = list[d.items[]]
print[i_list]
print[type[i_list]]
# [['key1', 1], ['key2', 2], ['key3', 3]]
# 

print[i_list[0]]
print[type[i_list[0]]]
# ['key1', 1]
# 

You can also use dict_items to perform set operations. See the following article for details.

• Set operations on multiple dictionary keys in Python

How do I get the value of a key in a list Python?

Can Python keys be a list?

How do I add a key

How do you find the values of a key in a list of dictionaries in Python?