Method 1: Using a for loop and the float() function

The first method to convert a list of strings to float is by using a for loop and the built-in float() function in Python. The for loop iterates through each element in the list and converts the string to float using the float() function.

# Program to convert a list of strings to float
string_list = ['2.5', '3.7', '4.8', '1.9']

# Creating an empty list to store the float values
float_list = []

# Converting each string element to float and adding to the float list
for i in string_list:
    float_list.append(float(i))

# Printing the float list
print(float_list)

Output:

[2.5, 3.7, 4.8, 1.9]

In the above program, we have defined a list of strings called string_list. We have created an empty list called float_list to store the float values. Then we have used a for loop to iterate through each element in the string_list. Inside the for loop, we have converted each string element to float using the built-in float() function and added the float value to the float_list. Finally, we have printed the float_list, which contains the converted float values.

Method 2: Using list comprehension and the float() function

To convert a list of strings to float is by using list comprehension and the float() function in Python. List comprehension is a concise way to create lists in Python. It provides a more efficient way to write the same code as in the previous method. 

# Program to convert a list of strings to float using list comprehension
string_list = ['2.5', '3.7', '4.8', '1.9']

# Converting each string element to float using list comprehension
float_list = [float(i) for i in string_list]

# Printing the float list
print(float_list)

Output:

[2.5, 3.7, 4.8, 1.9]

In the above program, we have defined a list of strings called string_list. We have used list comprehension to create a new list called float_list. Inside the list comprehension, we have used the float() function to convert each string element to float. Finally, we have printed the float_list, which contains the converted float values.