14
edits
Changes
m
x1234 x3058 is not an integer.12x34 3058 is not an integer.1234 8503x is an not integer.1234x 8503 is not an integer.
→PART 2 - Searching and Validating
==PART 2 - Searching and Validating==
:This second part will study how to look for specific character(s) in a string object and also how to verify that a given string object contains only certain type of characters.
:'''Perform the following steps:'''
offset = 0
length = len(text)
while offset < length:
print(offset, text[offset])
offset = offset + 1
if __name__ == '__main__':
s1 = 'Seneca'
print(s1,'contains letter s? ->',find(s1,'s')) print(s1,'contains letter S? ->',find(s1,'S'))
</source> The find() function defined above, is not needed, as it can be replaced by the python keyword '''in''', which can be used as a boolean operator. This boolean operator takes two strings, and return '''True''' if the first appears as a substring in the second.<br/>
'''Create a Python script to validate user input'''
:'''Perform the following instructions'''
:# Create the '''~/ops435/lab4/lab4e.py ''' script. The purpose of this script is to define a function called is_digits(), which takes a string object as its argument and return True if all the characters in the string are all digits, i.e 0, 1, 2, 3, 4, 5, 6, 7, 8, and 9; return False if any one of the characters is not a digit.
:# Use the following template to get started:<source lang="python">
#!/usr/bin/env python3
if __name__ == '__main__':
test_list = ['x1234x3058','12x343058','12348503x','1234x8503']
for item in test_list:
if is_digits(item):
:::'''Sample run 1:'''<source lang="python">
./lab4e.py
</source>
:::'''Sample run 2 (with import):'''<source lang="python">
import lab4e
print(is_digits('5665'))
# will output True
print(is_digits('1F'))
<li style="margin-left:25px;">Before proceeding, make certain that you identify all errors in lab4e.py. When the checking script tells you everything is OK - proceed to the next step.</li></ol>
= LAB 4 SIGN-OFF (SHOW INSTRUCTOR) === Show to Instructor in class ==
[[Image:lab1_signoff.png|thumb|right|450px|Students should be prepared with '''all required commands (system information) displayed in a terminal (or multiple terminals) prior to calling the instructor for signoff'''.]]
:'''Have the following Ready to Show Your Instructor:'''
::<span style="color:green;font-size:1.5em;">✓</span> Output of: <code>./CheckLab4.py -f -v</code>
::<span style="color:green;font-size:1.5em;">✓</span> Output of: <code>cat lab4a.py lab4b.py lab4c.py lab4d.py lab4e.py</code>
== Upload to Blackboard by the due date ==
:: Capture and name the output of <code>python3 ./CheckLab4.py -f -v </code> as lab4_[seneca_id].txt.
:: Upload the file lab4_[seneca_id].txt and your python scripts: lab4a.py, lab4b.py, lab4c.py, lab4d.py, and lab4e.py to blackboard individually.
= LAB REVIEW =
# List and briefly explain the following string methods:<br>'''lower()''' , '''upper()''' , '''swapcase()''' , '''title()''' , '''captilize()''' , '''split()'''
# Assume you issued the following command in your ipython3 shell:<br>'''course_name = 'Programming with Python''''<br>What will be the output for each of the following Python commands?<ol type="a"><li>'''course_name[3:11]'''</li><li>'''course_name[10:]'''</li><li>'''course_name[-1]</li></ol>
# Create a string object '''text = '"Seneca"''' in the Python Interactive shell and study the string methods: '''text.find()''', '''text.count()''' using the built-in help() function.
[[Category:OPS435-Python]][[Category:rchan]]
