CSCI 131 – Python Language
Python Language
• Emacs
• Input/Output Redirection
• Functions
Example 1:
• Create a directory BIO under your home directory. We will save all files in this directory. Type: mkdir BIO
• Change directory to your class directory, type the following on the Unix prompt: cd BIO
• Open a new file: emacs prog1.py &
• In the file prog1.py type the following program, including the comment lines
#In this example function has one numeric parameter and function has a return value
#function definition
def circleArea (radius):
area= radius *radius *3.14
return area
# main function that uses the function welcome
radius = 2.5
#function call inside print statement
print circleArea ( radius )
print circleArea ( 3.5)
radius = 4.5
#function call in assignment statement
areaResult = circleArea ( radius )
print areaResult
• Save your program
• Go to the login window and type the following on the Unix prompt:
o chmod u+x prog1.py
o python prog1.py
• Observe the result
Example 2:
• Open a new file: emacs prog2.py &
• In the file prog1.py type the following program, including the comment lines
#In this example function has one numeric parameter, function doesn’t have return value
#function definition
def mantra ( n ):
counter =0
while counter < n:
print “I love Python “
counter = counter +1
#main program
num = input (“please enter the number “)
print
print “the input value is “, num
#function call
print “the function result is “
print
mantra (num)
• Save your program
• Go to the login window and type the following on the Unix prompt:
o chmod u+x prog2.py
o python prog1.py
• Enter the input number after user prompt
• Observe the result
• Create a new file that will include the data, do the following:
o Type on the Unix prompt: emacs data &
o In the file type: 7
• Save the file and exit
• Go to the login window and type the following on the Unix prompt: python prog2.py < data
• Observe the result
• Go to the login window and type the following on the Unix prompt: python prog2.py < data > prog_result
• Open file with results by typing: emacs prog_result &
• Observe the results of the calculations
Examples 3 and 4 provide more information about the functions in Python. Type each program in the separate file and run the program to observe the results.
Example 3:
#In this example function doesn’t have any parameters, function doesn’t has return value
#function definition
def fiveStars ( ):
print “*****”
#main program
num = input ( “Please enter the number “)
counter =0
while ( counter < num ):
fiveStars ( )
counter = counter +1
Example 4:
#function definition
def scoreAlign (seq1, seq2):
i=0
sum=0
length=len(seq1)
while i ................
................
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