[learn Python from simple to deep] tuple

Python Tuples in are similar to lists , The difference is

（1） Elements of tuples cannot be modified or deleted , But it can be sliced and connected .
（2） Tuples use braces , The list uses brackets
（3） Single element tuple A comma must be added to the definition (,)

One 、 Define a tuple

# Define a tuple 
t1=(20,10,'abc','Python')
print(t1)

(20, 10, ‘abc’, ‘Python’)

Two 、 Common operations

# Get elements by index 
print(t1[0])

20

print(t1[1:3])

(10, ‘abc’)

# Concatenation of tuples ,+
t2=(50,'Hadoop','Spark')
print(t1+t2)

(20, 10, ‘abc’, ‘Python’, 50, ‘Hadoop’, ‘Spark’)

Be careful 1： Tuple of an element , Add a... At the back “,”
Be careful 2： Arbitrary with “,” Separate sequences , Default is tuple .
Be careful 3：Python Tuples tuple() Function to convert a list to a tuple .