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Python Print()

Jan 18, 20253 min read

Index

  1. Introduction
  2. Syntax
  3. All the different ways of printing a string
  4. f-string
  5. Print parameters
    1. End Parameters (optional)
    2. Sep Parameters (optional)
    3. File (optional)
    4. Flush parameter (optional)

Introduction

The print() function prints the specified message to the screen, or other standard output device.

The message can be a string, or any other object, the object will be converted into a string before written to the screen.

Syntax

print(*args, sep=' ', end='\n', file=None, flush=False)

Brackets use: if you want to print a string directly from the print function you can open a string with:

  • ” : doing so you can use ’ without closing the string
  • ’ : doing so you can use ” without closing the string
print("I'm Matteo's computer") 
print('The computer said: "I am the computer of Matteo"')

*args use: you can print all the element in a iterable object

L = ["Ciao", "Hello", "Hola"]
print(L)   #Output: ["Ciao", "Hello", "Hola"]
print(*L)  #Output: Ciao Hello Hola
 
#OSS: its the same thing of a for
#    for e in L:
#        print(e, end='')   #Output: Ciao Hello Hola

All the different ways of printing a string

name = "Matteo"
age = 20
 
print(f" I'm {name} and i'm {age} years old")
print("I'm   and i'm {} years old", name, age)
print("I'm " + str(name) +  " and i'm " + str(age) + "years old")
print("I'm ", name, "and i'm", age, "years old")

f-string

f-strings allow you to easily incorporate Python expressions into strings using the syntax {expression}.

Here are some examples of f-strings in Python:

name = "Mario"
age = 30
 
# incorporate variables into a string
print(f"My name is {name} and I'm {age} years old.")
 
# evaluate expressions within a string
print(f"{name.upper()} is shouting!")
 
# incorporate formatted values into a string
num = 42
print(f"The answer to everything is {num:03d}")

oss: Using f-strings let you print print data types different form a sting without converting them

print(f" I'm {name} and i'm {age} years old")
print("I'm " + str(name) +  " and i'm " + str(age) + "years old")

The print function has some parameters that let you interact with the output of the function

End Parameters (optional)

The end parameter decide witch character goes at the end of the print

By default Python‘s print() function ends with a newline

print("Welcome to")
print("Europe")
 
# Output: Welcome to
#         Europe

But it can be changed with every string or Python Escaping Sequences

print("Welcome to", end=' ')
print("Europe")
 
# Output: Welcome to Europe

Sep Parameters (optional)

The step parameter decide witch character separates 2 o more objects, by default its a space symbol (” ”)

a = 5
b = 5
 
print(a, b) #Output: 5 5

but it can be change with every string or Python Escaping Sequences

 
a = 5
b = 5
 
print(a, b, sep = "=") #Output: 5=5

File (optional)

In Python, you can print objects to the file by specifying the file parameter.

By default is set as sys.stdout which prints objects on the screen

But it can be change with every file thats open in writing mode

sourceFile = open('python.txt', 'w')
print('1', file = sourceFile)
print('2', file = sourceFile)
print('3', file = sourceFile)
sourceFile.close()
 
file content:
--------------------------
1
2
3
--------------------------

This program in particular tries to open python.txt, but if it doesn’t exist in the directory that you are working in it will be created

oss: every time you open the file in this way all the text inside the file will be cleared

Read Python Files to learn more

Flush parameter (optional)

  • Boolean value, specifying if the output is flushed (True) or buffered (False).
  • ByDefault is False|

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