Besides the while statement just introduced, Python knows the usual control flow statements known from other languages, with some twists.除了之前介紹的while語句，Python同樣支持其他語言通常用的控制流語句，但也有一些區別。

if Statements

Perhaps the most well-known statement type is the if statement. For example:

>>> x = int(input("Please enter an integer: "))

Please enter an integer: 42

>>> if x < 0:

... x = 0

... print('Negative changed to zero')

... elif x == 0:

... print('Zero')

... elif x == 1:

... print('Single')

... else:

... print('More')

...

More

There can be zero or more elif parts, and the else part is optional. The keyword ‘elif’ is short for ‘else if’, and is useful to avoid excessive indentation. An if … elif … elif … sequence is a substitute for the switch or case statements found in other languages.可以有多個elif語句，關鍵詞elif是else if的縮簡寫，用于縮減語句長度。if … elif … elif … 與其他語言的switch或case語句的作用相近。

if condition_1:

statement_block_1

elif condition_2:

statement_block_2

else:

statement_block_3

eg:例如

var1 = 100

if var1:

print ("1 - if 表達式條件為 true")

print (var1)

var2 = 0

if var2:

print ("2 - if 表達式條件為 true")

print (var2)

print ("Good bye!")

結果是：

1-if表達式條件為true100Good bye!

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