* The structure of the if-else statement has the form:
```
if (condition1 is true):
do A
elif (condition2 is true):
do B
else:
do C
```
* example 1: grading test scores
```
In [1]: grade=None
In [2]: score=86
In [3]: if (score>93):
...: grade='A'
...: elif (score>85):
...: grade='B'
...: else:
grade='C'
In [4]: grade
Out[4]: 'B'
```
* example 2: palindrome
```
In [8]: seq1="ACTCA"
In [9]: if seq1==seq1[::-1]:
...: print("%s is a palindrome!" % seq1)
...:
ACTCA is a palindrome!
```
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