Python | Key-Value to URL Parameter Conversion

Many times, while working in the web development domain, we can encounter a problem in which we require to set as URL parameters some of the key-value pairs we have, either in form of tuples, or a key and value list. Let’s discuss a solution for both cases.

Method #1: Using urllib.urlencode() ( with tuples ) The urlencode function is root function that can perform the task that we wish to achieve. In the case of tuples, we can just pass the tuples and encoder does the rest of conversion of string. Works only with Python2. 

Python

# Python code to demonstrate working of
# Key-Value to URL Parameter Conversion
# Using urllib.urlencode() ( with tuples )
import urllib

# initializing tuples
test_tuples = (('Gfg', 1), ('is', 2), ('best', 3))

# printing original tuples
print("The original tuples are : " + str(test_tuples))

# Using urllib.urlencode() ( with tuples )
# Key-Value to URL Parameter Conversion
res = urllib.urlencode(test_tuples)

# printing URL string
print("The URL parameter string is : " + str(res))

Output

The original tuples are : (('Gfg', 1), ('is', 2), ('best', 3))
The URL parameter string is : Gfg=1&is=2&best=3

Method #2: Using urllib.urlencode() ( with dictionary value list ) This method is when we have a dictionary key and many values corresponding to them as a potential candidate for being the URL parameter. In this case we perform this function. This also works with just Python2. 

Python

# Python code to demonstrate working of
# Key-Value to URL Parameter Conversion
# Using urllib.urlencode() ( with dictionary value list )
import urllib

# initializing dictionary
test_dict = {'gfg': [1, 2, 3]}

# printing original dictionary
print("The original dictionary is : " + str(test_dict))

# Using urllib.urlencode() ( with dictionary value list )
# Key-Value to URL Parameter Conversion
res = urllib.urlencode(test_dict, doseq=True)

# printing URL string
print("The URL parameter string is : " + str(res))

Output

The original dictionary is : {'gfg': [1, 2, 3]}
The URL parameter string is : gfg=1&gfg=2&gfg=3

Method #3 : Using list(),map() and join() methods

Python3

# Python code to demonstrate working of
# Key-Value to URL Parameter Conversion

# initializing tuples
test_tuples = (('gfg', 1), ('is', 2), ('best', 3))

# printing original tuples
print("The original tuples are : " + str(test_tuples))

# Key-Value to URL Parameter Conversion
res = []
for i in test_tuples:
    x=list(map(str,i))
    a="=".join(x)
    res.append(a)
res="&".join(res)

# printing URL string
print("The URL parameter string is : " + str(res))

Output

The original tuples are : (('gfg', 1), ('is', 2), ('best', 3))
The URL parameter string is : gfg=1&is=2&best=3