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One of the most powerful features of the Python programming language is its ability to iterate over a list. This allows you to easily manipulate a list of data without having to write complex code.

In this blog post, we will discuss Python for Loop Iteration, and show some examples of how it can use. Stay tuned, because at the end of this post we will also provide a link to download our free Python cheatsheet!

Python for Loop Iteration: How to Easily Manipulate a List

Python’s for loop is a construct that allows you to iterate over a list of data. The for loop will take each element in the list, and perform the given operation on it.

For example, let’s say we have a list of numbers, and we want to print each number out to the screen. We could do this using a for loop:

#python

numbers = [0, 1, 2, 3, 4]
for num in numbers:
	print(num)

This code would output the following:

0
1
2
3
4

Read More: Python merges dictionaries with the same value

Way to find the first characters of a string using Python. Here we go.

String provides an [] operator to accept any character in it by index position in Python. To get the first character you have to pass the index position in the large bracket. You will get a return while passing the value.

Let’s get started.

Get the first characters of a string in Python

As you know, in Python, the string character index starts from 0. Now you want to get the first character of a string just use the [] operator i.e, and call the print (0).

Let’s follow the below code.

# Get first character of string i.e. char at index position 0

#                      0123456789
get_first_character = "WHOlEBLOGs"
first_char = get_first_character[0]
print('First character : ', get_first_character[0])

We want to show you some ways that can save your time and that are very easy to use.

Let’s see what is that.

Here we made three variables with the following name:

• start_index_pos:
• end_index_pos:
• step_size:

start_index_pos: it fetches values from the beginning, and as you know well in Python there is a default value in starting like 0.

Why not have an example as well?

start_index_pos = "WHOlEBLOGS"

first_char = start_index_pos[0]
print(first_char)

end_index_pos: Wanna get the last value of the string? With the help of this simple variable. I hope it will be helpful to you. It saves all kinds of position in it. The default value is the end of the string.

end_index_pos = "WHOlEBLOGS"

first_char = end_index_pos[-1]
print(first_char)

step_size: Here you can get the interval value. Its default is 1.

step_size = "WHOLEBLOGS"

interval_char = step_size[5:10]
print(interval_char)

SyntaxError: String index out of range

Why are you getting string index out of range again and again? Before calling the variable you made just assign the len() function over there. It will return the exact value according to what you want. Python has a range() function for the help of picking the exact string you want.

Here I have completed a simple guide for you. I hope you liked it.

In this post, you will learn how to convert a tuple to a string in Python as well as we have three ways to convert that can very help full to you. In Python, you can store the multiple items in just a single variable as much as you want.

Convert Tuple To String In Python

Let’s get started

Use str.join() function

In Python, the first & very simple method to convert is str.join() function. It generates a string by concatenating the strings in a tuple.  It returns strings that contain all the elements of the sequence joined by a string separator.

In the below code, we create a tuple list and use the join() to add all the characters in the input tuple and then convert it to string. After that use the str.join() function to convert a tuple into a string.

tup1 = ('w','h','o','l','e')

# Use str.join() to convert tuple to string.
str = ''.join(tup1)
print (str)

Output:

whole

Using For Loop

First of all, create an empty string using for loop iterate then through the elements of the tuple. Keep it up adding each element to the empty string. It’s one of the simplest and easiest way, By using the way, the tuple value is converted to a string.

# into a string using a for loop
 
 
def convertTuple(tup):
        # initialize an empty string
    str = ''
    for wholeblogs in tup:
        str = str + wholeblogs
    return str
 
 
# Driver code
tuple = ('w', 'h', 'o', 'l', 'e')
str = convertTuple(tuple)
print(str)

Output:

whole

Using reduce() function

You can use reduce() function to apply a particular function passed in it’s argument. To all of the list elements mentioned. Now we are passing the add operator in the functions to concatenate the characters of the tuple.

Process to use reduce() function

• First, import functools as well as import operator.
• Made function.
• After that make a tuple list.
• Make the second variable to convert & just print().

# into a string using reduce() function
import functools
import operator
 
 
def convertTuple(tup):
    str = functools.reduce(operator.add, (tup))
    return str
 
 
# Driver code
tuple = ('W', 'h', 'o', 'l', 'e')
str = convertTuple(tuple)
print(str)

Output:

whole

Using  str.join() and map() function

Above we show that the str.join() function works well Here we are talking about only string objects as the tuple elements.

Note: If the tuple contains comes at least one non-string object then str.join() function will be failed & show TypeError as a String object cannot be added to a non-string object.

To avoid this error we have to use the map() function inside the join(). The map() function will take the iterator of the tuple and str() function such as its parameters.

let’s see the code & output

# into a string using str.join() & map() functions
 
 
def convertTuple(tup):
    st = ''.join(map(str, tup))
    return st
 
 
# Driver code
tuple = ('w', 'h', 'o', 'l', 'e ',  5)
str = convertTuple(tuple)
print(str)

Output:

whole 5

Read More: How to Convert C++ to Python

Good to hear, that you want to convert a string to a numeric variable with the precision equivalent to double type in Python. Python doesn’t have any double type variable but… float type has the same precision as double in other programming languages.

In this post, we will help you to convert strings to double by using the two methods that you can see below.

Let’s get started

Convert String to Double

• Using float() method
• Using decimal()

Process to use float() method:

It’s you know that the float() function accepts numbers & strings and returns the floating-point numbers as you can see in the output.

• First, make a variable and give the float number.
• Now make the second variable for converting
• And just print()
• so, let’s see what will return

whole = "10.02"
print("This is the initial string: " + whole)
 
# Converting to double
wholeblogs = float(whole)
print("The conversion of string to double is", wholeblogs)
 
wholeblogs = wholeblogs + 1
print("The converted string to double is incremented by 1:", wholeblogs)

Process to use decimal()  method:

As we told you above the decimal.Decimal() constructor, the decimal modules take a numeric value as input and convert it into a decimal type, it can have as much precision as needed that can exactly store and represent all the numeric values.

• First, import it like this from decimal import Decimal.
• Make a variable and give the float number.
• Now make the second variable for converting
• And just print()

from decimal import Decimal
 
 
whole = "10.02"
print("This is the initial string: " + whole)
 
# Converting to double
wholeblogs = Decimal(whole)
print("The conversion of string to double is", wholeblogs)
 
wholeblogs = wholeblogs+1
print("The converted string to double is incremented by 1:", wholeblogs)

Read More: Convert a list of dictionaries to pandas DataFrame

A string is an array of characters and part of just about any programming language. In Python, the string index out of range means that which character you are finding that is not exit in your give list.

On this page, we are here to help out you to avoid this error. First of all, we want to show you one example that will give you this error.

let’s get started

String index out of range Solution

Example

English = "A", "B","C", "D", "E"
print(English[5])

Output:

Traceback (most recent call last):
     File "E:\py\test.py", line 53, in <module>
           print(English_[5])
IndexError: tuple index out of range

Above you can see the string index out of range came, why it came. Because we are taking something that does not exist.

The len() function

Every single programmer needs to know that The index starts from 0 and ends with the number of characters in the string. So, First need to know the len() of your variable to know the len() follow the below code. Get Length Of List In Python.

English = "A", "B","C", "D", "E"
print(len(English))

For example:

You have a list of English characters such as make a  variable = [“A”, “B”, “C” “D”, “E”], you want to get C how will you get it? just print(English[2]) for more understanding follow the below code.

#          0    1   2    3    4
English = "A", "B","C", "D", "E"
print((English)[2])

Read More: Python IndexError: list assignment index out of range

On this page, we will discuss how to remove empty strings from a list of strings. It’s a date object which stores some space in the memory.

A Python list is a sequential collection of data objects and empty strings as well. Even if it represents a false value in Python. We have described the best 4 ways to kick out this error.

Let’s get started!

Remove Empty Strings From a List Of Strings

1. Using remove()
2. Using List Comprehension
3. Use join() + split()
4. Using filter()

Process to use remove() function

The remove() function is very easy to use, some people are not recommending to use this, but it performs the task well. It generally removes the first empty string and keeps doing iterate this process until no empty string is found in the list.

test_list = ["", "Wholeblogs", "", "is", "best", ""]
 
# Printing original list
print ("Original list is : " + str(test_list))
 
# using remove() to
# perform removal
while("" in test_list) :
	test_list.remove("")
 
# Printing modified list
print ("Modified list is : " + str(test_list))

Output:

Original list is : [”, ‘Wholeblogs’, ”, ‘is’, ‘best’, ”]

Modified list is : [‘Wholeblogs’, ‘is’, ‘best’]

Using for loops

You can easily remove the empty string from a list using loops it’s a simple technique. There is no issue to use any kind of loops in Python. While or for loop? Which one you feel better.

Let’s see how you can create a Python script:

• First of all, make a list, and assign names with a few of them that should be empty.
• Then use the while loop and in the last just use print() function.

Let’s have a quick code here.

wholeblogs = ["one", "" , "Two", "three", "four", "five", "", "six","", "", "seven", "eight", "", "" ,"Nine", "ten"]
 
for i in wholeblogs:
	if "" in wholeblogs:
		wholeblogs.remove("")

print(wholeblogs)

Output:

[‘one’, ‘Two’, ‘three’, ‘four’, ‘five’, ‘six’, ‘seven’, ‘eight’, ‘Nine’, ‘ten’]

Using filter()

If you want fast service then we & many peoples are recommending it with highly. Because it is too fast. It is the most pretty easy to remove empty.

Wholeblogs = ["A", " " , "B", "C", "D", "E", " ", "F"," ", "G", " ", "H", " ", "I" ,".....", "Z"]

Wholeblogs = list(filter(lambda string : string.strip(), Wholeblogs))

print(Wholeblogs)

Output:

[‘A’, ‘B’, ‘C’, ‘D’, ‘E’, ‘F’, ‘G’, ‘H’, ‘I’, ‘…..’, ‘Z’]

Using list comprehension

Here In List comprehension, you can also remove empty strings from a list of strings let’s see the process of list comprehension.

Wholeblogs = ["", "Wholeblogs", "", "is", "great platform", ""]

# Printing original list
print ("Original list is : " + str(Wholeblogs))

# using list comprehension to
# perform removal
Wholeblogs = [i for i in Wholeblogs if i]

# Printing modified list
print ("Modified list is : " + str(Wholeblogs))

Output:

Original list is : [”, ‘Wholeblogs’, ”, ‘is’, ‘great platform’, ”]

Modified list is : [‘Wholeblogs’, ‘is’, ‘great platform’]

join() split()

You can also be achieved this task by join() & split() operations in Python.

The join() first of all combines all strings so that empty space is removed.

Wholeblogs = ["", "Wholeblogs", "", "is", "great platform", ""]

# Printing original list
print ("Original list is : " + str(Wholeblogs))

# using join() + split() to
# perform removal
Wholeblogs = ' '.join(Wholeblogs).split()

# Printing modified list
print ("Modified list is : " + str(Wholeblogs))

Output:

Original list is : [”, ‘Wholeblogs’, ”, ‘is’, ‘great platform’, ”]

Modified list is : [‘Wholeblogs’, ‘is’, ‘great’, ‘platform’]