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Python_02_problemset
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512 lines (351 loc) · 11.3 KB
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Python_02 problemset
1.
>>> 'ATG' in 'GTACCTTGATTTCGTATTCTGAGAGGCTGCTGCTTAGCGGTAGCCCCTTGGTTTCCGTGGCAACGGAAAA'
False
2. >>> 'TTT' in 'GTACCTTGATTTCGTATTCTGAGAGGCTGCTGCTTAGCGGTAGCCCCTTGGTTTCCGTGGCAACGGAAAA'
True
3. dna = 'GTACCTTGATTTCGTATTCTGAGAGGCTGCTGCTTAGCGGTAGCCCCTTGGTTTCCGTGGCAACGGAAAA'
>>> dna = 'GTACCTTGATTTCGTATTCTGAGAGGCTGCTGCTTAGCGGTAGCCCCTTGGTTTCCGTGGCAACGGAAAA'
>>> 'ATG' in dna
False
>>> 'TTT' in dna
True
4. In the interpretor use bool to test a variety of values like '', 0, 0.0, FALSE, false, True, true, 'True', 'False' to see if they evalue to True or False
'', 0, 0.0, FALSE, false, True, true, 'True', 'False'
>>> '0'
'0'
>>> bool('')
False
>>> bool(0)
False
>>> bool('0')
True
>>> bool(FALSE)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
NameError: name 'FALSE' is not defined
>>> bool(false)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
NameError: name 'false' is not defined
>>> bool('FALSE')
True
>>> bool('false')
True
>>> bool('True')
True
>>> bool('true')
True
>>> bool (True)
True
>>> bool (true)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
NameError: name 'true' is not defined
>>> bool(false)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
NameError: name 'false' is not defined
>>> bool(False)
False
5. Using a text editor, write a script that
Assigns a value to a variable
Has a if/else statment in which:
It prints out a confirmation of truth if the value is true
It prints out "Not True" if the value is not true.
pfb14:files admin$ nano myscript_3.py
#!/usr/bin/env python3
#assign a value to a variable
variable1=23
if variable1 % 2 == 0:
message = "is even"
print(variable1, message)
if variable1 % 2 != 0:
message = "is odd"
print (variable1, message)
elif variable1 > 21:
message = "is very big"
print (variable1, message)
elif variable1 < 21:
message = "is puny"
print(variable1, message)
else:
message = "is the same!"
print(variable1, message)
pfb14:files admin$ python3 myscript_3.py
23 is odd
*didn't proceed further because it matched with the first if statement.
pfb14:files admin$ nano myscript_3.py
#!/usr/bin/env python3
#assign a value to a variable
variable1=23
if variable1 % 2 == 0:
message = "is even"
print(variable1, message)
elif variable1 > 21:
message = "is very big"
print (variable1, message)
elif variable1 < 21:
message = "is puny"
print(variable1, message)
else:
message = "is the same!"
print(variable1, message)
pfb14:files admin$ python3 myscript_3.py
23 is very big
7. Write a new script that does the same as the last question, but gets the value from the command line.
pfb14:files admin$ nano myscript_4.py
#!/usr/bin/env python3
import sys
#Assigns a value to a variable and include an if/else statement
if a = float(sys.argv[1]) % 2 == 0:
message = "is even"
print(sys.argv[1], message)
elif a = float(sys.argv[1]) > 21:
message = "is very big"
print (sys.argv[1], message)
elif a = float(sys.argv[1]) < 21:
message = "is puny"
print(sys.argv[1], message)
else:
message = "is the same!"
print(sys.argv[1], message)
pfb14:files admin$ python3 myscript_4.py 22
File "myscript_4.py", line 6
if a = float(sys.argv[1]) % 2 == 0:
^
SyntaxError: invalid syntax
pfb14:files admin$ nano myscript_4.py
#!/usr/bin/env python3
import sys
#Assigns a value to a variable and include an if/else statement
variable1 = sys.argv[1]
if a = variable1 % 2 == 0:
message = "is even"
print(variable1, message)
elif a = variable1 > 21:
message = "is very big"
print (variable1, message)
elif a = variable1 < 21:
message = "is puny"
print(variable1, message)
else:
message = "is the same!"
print(variable1, message)
pfb14:files admin$ python3 myscript_4.py 23
File "myscript_4.py", line 8
if a = variable1 % 2 == 0:
^
SyntaxError: invalid syntax
pfb14:files admin$ nano myscript_4.py
!/usr/bin/env python3
import sys
#Assigns a value to a variable and include an if/else statement
variable1 = sys.argv[1]
if variable1 % 2 == 0:
message = "is even"
print(variable1, message)
elif variable1 > 21:
message = "is very big"
print (variable1, message)
elif variable1 < 21:
message = "is puny"
print(variable1, message)
else:
message = "is the same!"
print(variable1, message)
pfb14:files admin$ python3 myscript_4.py 23
Traceback (most recent call last):
File "myscript_4.py", line 8, in <module>
if variable1 % 2 == 0:
TypeError: not all arguments converted during string formatting
pfb14:files admin$ nano myscript_4.py
#!/usr/bin/env python3
import sys
#Assigns a value to a variable and include an if/else statement
variable1 = float(sys.argv[1])
if variable1 % 2 == 0:
message = "is even"
print(variable1, message)
elif variable1 > 21:
message = "is very big"
print (variable1, message)
elif variable1 < 21:
message = "is puny"
print(variable1, message)
else:
message = "is the same!"
print(variable1, message)
pfb14:files admin$ python3 myscript_4.py 23
23.0 is very big
pfb14:files admin$ python3 myscript_4.py 23
23.0 is very big
pfb14:files admin$ python3 myscript_4.py 21
21.0 is the same!
pfb14:files admin$ python3 myscript_4.py 20
20.0 is even
pfb14:files admin$ python3 myscript_4.py 19
19.0 is puny
8. Create a script that has a if/elif/else statement that
Tests to see if a number is positive or negative
if it is positive, is it bigger or smaller than 50
if it is smaller, is it an even number
if it is larger, is it divisible by 3.
pfb14:files admin$ nano myscript_5.py
pfb14:files admin$ python3 myscript_5.py 54
File "myscript_5.py", line 11
elif variable1 > 50 and % 3 ==0:
^
SyntaxError: invalid syntax
pfb14:files admin$ nano myscript_5.py
#!/usr/bin/env python3
#assign a value to a variable
variable1 = float(sys.argv[1])
if variable1 < 0:
message = "is negative"
print(variable1, message)
elif variable1 > 50 and variable1 % 3 ==0:
message = "is positive, is greater than 50, and divisible by 3"
print (variable1, message)
else:
message = "is something else"
print(variable1, message)
pfb14:files admin$ python3 myscript_5.py 54
Traceback (most recent call last):
File "myscript_5.py", line 5, in <module>
variable1 = float(sys.argv[1])
NameError: name 'sys' is not defined
pfb14:files admin$ nano myscript_5.py
#!/usr/bin/env python3
import sys
#stuff
variable1 = float(sys.argv[1])
if variable1 < 0:
message = "is negative"
print(variable1, message)
elif variable1 > 50 and variable1 % 3 ==0:
message = "is positive, is greater than 50, and divisible by 3"
print (variable1, message)
else:
message = "is something else"
print(variable1, message)
pfb14:files admin$ python3 myscript_5.py 54
54.0 is positive, is greater than 50, and divisible by 3
pfb14:files admin$ nano myscript_5.py
#!/usr/bin/env python3
import sys
#stuff
variable1 = float(sys.argv[1])
if variable1 < 0:
message = "is negative"
print(variable1, message)
elif variable1 > 50 and variable1 % 3 ==0:
message = "is positive, is greater than 50, and divisible by 3"
print (variable1, message)
elif variable1 < 50 and variable1 % 2 ==0:
message = "is positive, is less than 50, and is an even number"
print (variable1, message)
else:
message = "is something else"
print(variable1, message)
pfb14:files admin$ python3 myscript_5.py 54
54.0 is positive, is greater than 50, and divisible by 3
pfb14:files admin$ python3 myscript_5.py 22
22.0 is positive, is less than 50, and is an even number
pfb14:files admin$ python3 myscript_5.py 21
21.0 is something else
pfb14:files admin$ nano myscript_5.py
#!/usr/bin/env python3
import sys
#stuff
variable1 = float(sys.argv[1])
if variable1 < 0:
message = "is negative"
print(variable1, message)
elif variable1 > 50 and variable1 % 3 ==0:
message = "is positive, is greater than 50, and divisible by 3"
print (variable1, message)
elif variable1 < 50 and variable1 % 2 ==0:
message = "is positive, is smaller than 50, and is an even number"
print (variable1, message)
else:
message = "is positive"
print(variable1, message)
pfb14:files admin$ python3 myscript_5.py -4
-4.0 is negative
pfb14:files admin$ python3 myscript_5.py 19
19.0 is positive
pfb14:files admin$ python3 myscript_5.py 55
55.0 is positive
pfb14:files admin$ nano myscript_5.py
#!/usr/bin/env python3
import sys
#stuff
variable1 = float(sys.argv[1])
if variable1 < 0:
message = "is negative"
print(variable1, message)
elif variable1 > 50 and variable1 % 3 ==0:
message = "is positive, is greater than 50, and divisible by 3"
print (variable1, message)
elif variable1 < 50 and variable1 % 2 ==0:
message = "is positive, is smaller than 50, and is an even number"
print (variable1, message)
elif variable1 < 50 and variable1 % 2 !=0:
message = "is positive, is smaller than 50"
print (variable1, message)
elif variable1 > 50 and variable1 % 3 !=0:
message = "is positive, is greater than 50"
print (variable1, message)
else:
message = "is 0"
print(variable1, message)
pfb14:files admin$ python3 myscript_5.py 0
0.0 is positive, is smaller than 50, and is an even number
pfb14:files admin$ nano myscript_5.py
#!/usr/bin/env python3
import sys
#stuff
variable1 = float(sys.argv[1])
if variable1 ==0:
message = "is 0"
print (variable1, message)
elif variable1 < 0:
message = "is negative"
print(variable1, message)
elif variable1 > 50 and variable1 % 3 ==0:
message = "is positive, is greater than 50, and divisible by 3"
print (variable1, message)
elif variable1 < 50 and variable1 % 2 ==0:
message = "is positive, is smaller than 50, and is an even number"
print (variable1, message)
elif variable1 < 50 and variable1 % 2 !=0:
message = "is positive, is smaller than 50"
print (variable1, message)
elif variable1 > 50 and variable1 % 3 !=0:
message = "is positive, is greater than 50"
print (variable1, message)
elif variable1 ==0:
message = "is 0"
print (variable1, message)
else:
message = "is crap"
print(variable1, message)
pfb14:files admin$ python3 myscript_5.py 0
0.0 is 0
pfb14:files admin$ python3 myscript_5.py 54
54.0 is positive, is greater than 50, and divisible by 3
pfb14:files admin$ python3 myscript_5.py 59
59.0 is positive, is greater than 50
pfb14:files admin$ python3 myscript_5.py -2
-2.0 is negative
pfb14:files admin$ python3 myscript_5.py 68
68.0 is positive, is greater than 50
pfb14:files admin$ python3 myscript_5.py 72
72.0 is positive, is greater than 50, and divisible by 3
pfb14:files admin$ python3 myscript_5.py 32
32.0 is positive, is smaller than 50, and is an even number
pfb14:files admin$ python3 myscript_5.py 31
31.0 is positive, is smaller than 50
pfb14:files admin$ python3 myscript_5.py 33
33.0 is positive, is smaller than 50