Python If...Else

Last modified on: October 20, 2024

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<h3>Python <code>if...else</code> Statements Overview</h3>
<p>The <code>if...else</code> statement in Python is used for decision-making in code. It allows you to execute certain code blocks based on specific conditions. The <code>if</code> statement evaluates a condition and, if it is <code>True</code>, the code block associated with it is executed. If the condition is <code>False</code>, the <code>else</code> block (if present) is executed instead.</p>
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<p><strong>Basic <code>if</code> Statement</strong>: The simplest form of <code>if</code> is:</p>
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<pre class="language-python"><code>if condition:
    # Code to execute if the condition is True</code></pre>
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<p>Example:</p>
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<pre class="language-python"><code>x = 5
if x &gt; 3:
    print("x is greater than 3")</code></pre>
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<p><strong><code>if...else</code> Statement</strong>: The <code>else</code> statement provides an alternative block of code to run if the condition in the <code>if</code> statement is <code>False</code>.</p>
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<pre class="language-python"><code>if condition:
    # Code to execute if condition is True
else:
    # Code to execute if condition is False</code></pre>
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<p>Example:</p>
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<pre class="language-python"><code>x = 2
if x &gt; 3:
    print("x is greater than 3")
else:
    print("x is not greater than 3")</code></pre>
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<p><strong><code>elif</code> (else if) Statement</strong>: The <code>elif</code> statement allows you to check multiple conditions. If the initial <code>if</code> condition is <code>False</code>, the program evaluates the <code>elif</code> condition. If none of the conditions are <code>True</code>, the <code>else</code> block is executed.</p>
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<pre class="language-python"><code>if condition1:
    # Code to execute if condition1 is True
elif condition2:
    # Code to execute if condition2 is True
else:
    # Code to execute if both conditions are False</code></pre>
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<p>Example:</p>
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<pre class="language-python"><code>x = 10
if x &lt; 0:
    print("x is negative")
elif x == 0:
    print("x is zero")
else:
    print("x is positive")
</code></pre>
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<p><strong>Nested <code>if...else</code></strong>: You can nest <code>if</code> statements inside other <code>if</code> statements to check more complex conditions.</p>
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<pre class="language-python"><code>if condition1:
    if condition2:
        # Code to execute if both conditions are True
    else:
        # Code to execute if condition1 is True but condition2 is False</code></pre>
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<p>Example:</p>
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<pre class="language-python"><code>x = 10
if x &gt; 0:
    if x &gt; 5:
        print("x is greater than 5")
    else:
        print("x is between 1 and 5")
else:
    print("x is zero or negative")</code></pre>
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<h3>Python <code>if...else</code> Example</h3>
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<pre class="language-python"><code># Simple if statement
x = 5
if x &gt; 3:
    print("x is greater than 3")  # Output: x is greater than 3

# if...else statement
x = 2
if x &gt; 3:
    print("x is greater than 3")
else:
    print("x is not greater than 3")  # Output: x is not greater than 3

# if...elif...else statement
x = 10
if x &lt; 0:
    print("x is negative")
elif x == 0:
    print("x is zero")
else:
    print("x is positive")  # Output: x is positive

# Nested if statement
x = 10
if x &gt; 0:
    if x &gt; 5:
        print("x is greater than 5")  # Output: x is greater than 5
    else:
        print("x is between 1 and 5")
else:
    print("x is zero or negative")</code></pre>
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<h3>&nbsp;</h3>
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