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1 year ago

What are the two access modes that are used when opening a file for input and output when pickling?

1 answer:

8 0

The two access modes that are used when opening a file for input and output when pickling are rb and wb.

<h3>What is pickling?</h3>

Pickle is generally used in Python to serialize and deserialize a Python object structure. In other words, it is the act of transforming a Python object into a byte stream in order to save it to a file/database, maintain program state across sessions, or transport data over a network. By unpickling the pickled byte stream, the original object hierarchy can be recreated. This entire procedure is comparable to object serialization in Java or .Net.

When a byte stream is unpickled, the pickle module first makes an instance of the original object before populating it with the right data. To accomplish this, the byte stream only carries data relevant to the original object instance.

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Suppose you have two arrays of ints, arr1 and arr2, each containing ints that are sorted in ascending order. Write a static meth

telo118 [61]

Since both arrays are already sorted, that means that the first int of one of the arrays will be smaller than all the ints that come after it in the same array. We also know that if the first int of arr1 is smaller than the first int of arr2, then by the same logic, the first int of arr1 is smaller than all the ints in arr2 since arr2 is also sorted.

public static int[] merge(int[] arr1, int[] arr2) {
int i = 0; //current index of arr1
int j = 0; //current index of arr2
int[] result = new int[arr1.length+arr2.length]
while(i < arr1.length && j < arr2.length) {
result[i+j] = Math.min(arr1[i], arr2[j]);
if(arr1[i] < arr2[j]) {
i++;
} else {
j++;
}
}
boolean isArr1 = i+1 < arr1.length;
for(int index = isArr1 ? i : j; index < isArr1 ? arr1.length : arr2.length; index++) {
result[i+j+index] = isArr1 ? arr1[index] : arr2[index]
}
return result;
}

So this implementation is kind of confusing, but it's the first way I thought to do it so I ran with it. There is probably an easier way, but that's the beauty of programming.

A quick explanation:

We first loop through the arrays comparing the first elements of each array, adding whichever is the smallest to the result array. Each time we do so, we increment the index value (i or j) for the array that had the smaller number. Now the next time we are comparing the NEXT element in that array to the PREVIOUS element of the other array. We do this until we reach the end of either arr1 or arr2 so that we don't get an out of bounds exception.

The second step in our method is to tack on the remaining integers to the resulting array. We need to do this because when we reach the end of one array, there will still be at least one more integer in the other array. The boolean isArr1 is telling us whether arr1 is the array with leftovers. If so, we loop through the remaining indices of arr1 and add them to the result. Otherwise, we do the same for arr2. All of this is done using ternary operations to determine which array to use, but if we wanted to we could split the code into two for loops using an if statement.

4 0

4 years ago

In this exercise, your function will receive 2 parameters, the name of a text file, and a list of strings. The function will wri

diamong [38]

Answer:

# the function is defined

# it takes 2 arguments: filename and list of string

def solution(filename, listOfString):

# the file is opened in write mode

# so that we can write to it

with open(filename, 'w') as file_object:

# we loop through the entire list of string

# this looping help us know what to write to the file

for each_string in listOfString:

# if the length of the string is less than 4

# we write 'x' with a new line

if len(each_string) < 4:

file_object.write("x\n")

# else if the length of the string is greater than equals 4

# we write the fourth character

# and also add new line

else:

file_object.write(each_string[3])

file_object.write("\n")

Explanation:

The function is written in Python. It takes two argument; filename and list of string.

It opens the file in write mode and then loop through the list of string. During the loop, we know what to write to the file.

In the length of a string is less than 4; we write 'x' else we write the fourth character in the string. The fourth character has an index of 3 because string uses zero index counting like a string. Starting from zero; 0, 1, 2, 3, 4... the fourth character has an index of 3.

5 0

3 years ago

Select the phrases that apply to Java classes or methods.

oee [108]

Answer:

graficar una lista de entradas

crear un nuevo objeto

condiciones de prueba

romper un ciclo

Explanation:

7 0

3 years ago

What keeps unauthorized internet users out of private intranets?

Kruka [31]

I think coders put in codes. Sry if that does not help.

8 0

3 years ago

What can Strings store

horsena [70]

A string is generally considered as a data type and is often implemented as an array data structure of bytes (or words) that stores a sequence of elements, typically characters, using some character encoding. String may also denote more general arrays or other sequence (or list) data types and structures.

5 0

4 years ago

Read 2 more answers