Develop Reference

Python composed Lists [duplicate]

This question already has answers here:
Check if a number is odd or even in Python [duplicate]
(6 answers)
Closed 1 year ago.
I would just like a tip on how to send even numbers to the left and odd numbers to the right, I've been trying for a long time and I can't, the subject is composed lists, I appreciate any help. Simplified code below without loop or conditional structure.
test = [[],[]]
num = int (input("Type it : "))
test.append()
print(test)

test = [[], []]
num = input("Enter a number or quit")
while num != "quit": # execute code as long as num is not quit
num = int(num) # convert num to a number (until here, it's a string !!!)
if num % 2 == 0: # num is even
test[0].append(num)
else: # num is odd
test[1].append(num)
print(test)

Why this WHILE loop does not end? [Python] [duplicate]

This question already has answers here:
How can I read inputs as numbers?
(10 answers)
Closed 2 years ago.
im trying to create a multiple values calculator in Python, using While, For/In sentences with lists
numbers = []
out = 0
while out == 0:
numbers.append(int(input('Add a number: ')))
out2 = input('''[0]To keep adding numbers
[1]To add and leave: ''')
if out2 == 1:
out == 1
#In theory if out == 1 the while loop should end and go to:
for add in numbers:
add = numbers
print(add)
I tried using While Not sentence, but i get an obvius mistake. I suppose this is a pretty dumb error of comprehention i have, but i can't really get what am i doing wrong. I'll be very glad if u help me with this.

First of all, variable assignment should be done with = not ==. Your problem is that in the second input() (where you let user choose will he/she stay or exit), you need to convert the input to int from string first, OR check by the string representation of the number (fail-safe):
while out == 0:
numbers.append(int(input('Add a number: ')))
out2 = input('''[0]To keep adding numbers
[1]To add and leave: ''')
if out2 == '1':
out = 1
However, best way to break out a loop is to use break:
while out == 0:
numbers.append(int(input('Add a number: ')))
out2 = input('''[0]To keep adding numbers
[1]To add and leave: ''')
if out2 == '1':
break

Apart from the errors pointed out in the other 2 answers, you are getting input from the user as a str and not converting it to an int.
So it never hits the if condition and therefore your program doesn't end.
Please try this
numbers = []
out = 0
while out == 0:
numbers.append(int(input('Add a number: ')))
out2 = input('''[0]To keep adding numbers
[1]To add and leave: ''')
print(type(out2))
if int(out2) == 1: # Convert the out2 to an int here
print(f" Inside if condition")
out = 1 # Use an assignment operator here

Need Help Using If Statements and Lists [duplicate]

This question already has answers here:
Check if item is in an array / list [duplicate]
(5 answers)
Closed 4 years ago.
I am new to python and am having a hard time figuring out where my issue begins, I believe that I am mis-defining the variable "primes" in my first if statement. I appreciate the help. The paragraph below is of the task that I am trying to accomplish.
Take a number from the user. Respond with the word "Unitary" if the number is 1, with the word "Prime" if the number is in the list and with the word "Composite" otherwise.
primes = [2,3,5,7,11,13,17,19,23,29,
31,37,41,43,47,53,59,61,67,71,
73,79,83,89,97,101,103,107,109,113,
127,131,137,139,149,151,157,163,167,173,
179,181,191,193,197,199,211,223,227,229,
233,239,241,251,257,263,269,271,277,281,
283,293,307,311,313,317,331,337,347,349,
353,359,367,373,379,383,389,397,401,409,
419,421,431,433,439,443,449,457,461,463,
67,479,487,491,499,503,509,521,523,541,
547,557,563,569,571,577,587,593,599,601,
607,613,617,619,631,641,643,647,653,659,
661,673,677,683,691,701,709,719,727,733,
739,743,751,757,761,769,773,787,797,809,
811,821,823,827,829,839,853,857,859,863,
877,881,883,887,907,911,919,929,937,941,
947,953,967,971,977,983,991,997,1009,1013,
1019,1021,1031,1033,1039,1049,1051,1061,1063,1069,
1087,1091,1093,1097,1103,1109,1117,1123,1129,1151,
1153,1163,1171,1181,1187,1193,1201,1213,1217,1223,
1229,1231,1237,1249,1259,1277,1279,1283,1289,1291,
1297,1301,1303,1307,1319,1321,1327,1361,1367,1373,
1381,1399,1409,1423,1427,1429,1433,1439,1447,1451,
1453,1459,1471,1481,1483,1487,1489,1493,1499,1511,
1523,1531,1543,1549,1553,1559,1567,1571,1579,1583,
1597,1601,1607,1609,1613,1619,1621,1627,1637,1657,
1663,1667,1669,1693,1697,1699,1709,1721,1723,1733,
1741,1747,1753,1759,1777,1783,1787,1789,1801,1811,
1823,1831,1847,1861,1867,1871,1873,1877,1879,1889,
1901,1907,1913,1931,1933,1949,1951,1973,1979,1987,
1993,1997,1999,2003,2011,2017,2027,2029,2039,2053,
2063,2069,2081,2083,2087,2089,2099,2111,2113,2129,
2131,2137,2141,2143,2153,2161,2179,2203,2207,2213,
2221,2237,2239,2243,2251,2267,2269,2273,2281,2287,
293,2297,2309,2311,2333,2339,2341,2347,2351,2357,
2371,2377,2381,2383,2389,2393,2399,2411,2417,2423,
2437,2441,2447,2459,2467,2473,2477,2503,2521,2531,
2539,2543,2549,2551,2557,2579,2591,2593,2609,2617,
2621,2633,2647,2657,2659,2663,2671,2677,2683,2687,
2689,2693,2699,2707,2711,2713,2719,2729,2731,2741,
2749,2753,2767,2777,2789,2791,2797,2801,2803,2819,
2833,2837,2843,2851,2857,2861,2879,2887,2897,2903,
2909,2917,2927,2939,2953,2957,2963,2969,2971,2999,
3001,3011,3019,3023,3037,3041,3049,3061,3067,3079,
3083,3089,3109,3119,3121,3137,3163,3167,3169,3181,
3187,3191,3203,3209,3217,3221,3229,3251,3253,3257,
3259,3271,3299,3301,3307,3313,3319,3323,3329,3331,
3343,3347,3359,3361,3371,3373,3389,3391,3407,3413,
3433,3449,3457,3461,3463,3467,3469,3491,3499,3511,
3517,3527,3529,3533,3539,3541,3547,3557,3559,3571,
3581,3583,3593,3607,3613,3617,3623,3631,3637,3643,
3659,3671,3673,3677,3691,3697,3701,3709,3719,3727,
3733,3739,3761,3767,3769,3779,3793,3797,3803,3821,
3823,3833,3847,3851,3853,3863,3877,3881,3889,3907,
3911,3917,3919,3923,3929,3931,3943,3947,3967,3989,
4001,4003,4007,4013,4019,4021,4027,4049,4051,4057,
4073,4079,4091,4093,4099,4111,4127,4129,4133,4139,
4153,4157,4159,4177,4201,4211,4217,4219,4229,4231,
4241,4243,4253,4259,4261,4271,4273,4283,4289,4297,
4327,4337,4339,4349,4357,4363,4373,4391,4397,4409,
4421,4423,4441,4447,4451,4457,4463,4481,4483,4493,
4507,4513,4517,4519,4523,4547,4549,4561,4567,4583,
4591,4597,4603,4621,4637,4639,4643,4649,4651,4657,
4663,4673,4679,4691,4703,4721,4723,4729,4733,4751,
4759,4783,4787,4789,4793,4799,4801,4813,4817,4831,
4861,4871,4877,4889,4903,4909,4919,4931,4933,4937,
4943,4951,4957,4967,4969,4973,4987,4993,4999,5003,
5009,5011,5021,5023,5039,5051,5059,5077,5081,5087,
5099,5101,5107,5113,5119,5147,5153,5167,5171,5179,
5189,5197,5209,5227,5231,5233,5237,5261,5273,5279,
5281,5297,5303,5309,5323,5333,5347,5351,5381,5387,
5393,5399,5407,5413,5417,5419,5431,5437,5441,5443,
5449,5471,5477,5479,5483,5501,5503,5507,5519,5521,
5527,5531,5557,5563,5569,5573,5581,5591,5623,5639,
5641,5647,5651,5653,5657,5659,5669,5683,5689,5693,
5701,5711,5717,5737,5741,5743,5749,5779,5783,5791,
5801,5807,5813,5821,5827,5839,5843,5849,5851,5857,
5861,5867,5869,5879,5881,5897,5903,5923,5927,5939,
5953,5981,5987,6007,6011,6029,6037,6043,6047,6053,
6067,6073,6079,6089,6091,6101,6113,6121,6131,6133,
6143,6151,6163,6173,6197,6199,6203,6211,6217,6221,
6229,6247,6257,6263,6269,6271,6277,6287,6299,6301,
6311,6317,6323,6329,6337,6343,6353,6359,6361,6367,
6373,6379,6389,6397,6421,6427,6449,6451,6469,6473,
6481,6491,6521,6529,6547,6551,6553,6563,6569,6571,
6577,6581,6599,6607,6619,6637,6653,6659,6661,6673,
6679,6689,6691,6701,6703,6709,6719,6733,6737,6761,
6763,6779,6781,6791,6793,6803,6823,6827,6829,6833,
6841,6857,6863,6869,6871,6883,6899,6907,6911,6917,
6947,6949,6959,6961,6967,6971,6977,6983,6991,6997,
7001,7013,7019,7027,7039,7043,7057,7069,7079,7103,
7109,7121,7127,7129,7151,7159,7177,7187,7193,7207,
7211,7213,7219,7229,7237,7243,7247,7253,7283,7297,
7307,7309,7321,7331,7333,7349,7351,7369,7393,7411,
7417,7433,7451,7457,7459,7477,7481,7487,7489,7499,
7507,7517,7523,7529,7537,7541,7547,7549,7559,7561,
7573,7577,7583,7589,7591,7603,7607,7621,7639,7643,
7649,7669,7673,7681,7687,7691,7699,7703,7717,7723,
7727,7741,7753,7757,7759,7789,7793,7817,7823,7829,
7841,7853,7867,7873,7877,7879,7883,7901,7907,7919,
7927,7933,7937,7949,7951,7963,7993,8009,8011,8017,
8039,8053,8059,8069,8081,8087,8089,8093,8101,8111,
8117,8123,8147,8161,8167,8171,8179,8191,8209,8219,
8221,8231,8233,8237,8243,8263,8269,8273,8287,8291,
8293,8297,8311,8317,8329,8353,8363,8369,8377,8387,
8389,8419,8423,8429,8431,8443,8447,8461,8467,8501,
8513,8521,8527,8537,8539,8543,8563,8573,8581,8597,
8599,8609,8623,8627,8629,8641,8647,8663,8669,8677,
8681,8689,8693,8699,8707,8713,8719,8731,8737,8741,
8747,8753,8761,8779,8783,8803,8807,8819,8821,8831,
8837,8839,8849,8861,8863,8867,8887,8893,8923,8929,
8933,8941,8951,8963,8969,8971,8999,9001,9007,9011,
9013,9029,9041,9043,9049,9059,9067,9091,9103,9109,
9127,9133,9137,9151,9157,9161,9173,9181,9187,9199,
9203,9209,9221,9227,9239,9241,9257,9277,9281,9283,
9293,9311,9319,9323,9337,9341,9343,9349,9371,9377,
9391,9397,9403,9413,9419,9421,9431,9433,9437,9439,
9461,9463,9467,9473,9479,9491,9497,9511,9521,9533,
9539,9547,9551,9587,9601,9613,9619,9623,9629,9631,
9643,9649,9661,9677,9679,9689,9697,9719,9721,9733,
9739,9743,9749,9767,9769,9781,9787,9791,9803,9811,
9817,9829,9833,9839,9851,9857,9859,9871,9883,9887,
9901,9907,9923,9929,9931,9941,9949,9967,9973,10007]
number = int(input("Choose A Number"))
if number == primes:print("Primes")
elif number == 1: print("Unitary")
else: print("Composite")

Should be
if number in primes
(not if number == primes)

number = int(input("Choose A Number"))
if number in primes:
print("Primes")
elif number == 1:
print("Unitary")
else:
print("Composite")

Change if line with
if number in primes:

How to find a specific number from a user inputed list in python [duplicate]

This question already has answers here:
Python - Count elements in list [duplicate]
(7 answers)
Closed 7 years ago.
I want the program to find the number of times a particular number occurs within a list. What am I doing wrong here?
def list1():
numInput = input("Enter numbers separated by commas: ")
numList = numInput.split(",")
numFind = int(input("Enter a number to look for: "))
count = 0
for num in numList:
if num == numFind:
count += 1
length = len(numList)
# dividing how many times the input number was entered
# by the length of the list to find the %
fraction = count / length
print("Apeared",count,"times")
print("Constitutes",fraction,"% of this data set")
list1()

numList isn't a list of numbers, it's a list of strings. Try converting to integer before comparing to numFind.
if int(num) == numFind:
Alternatively, leave numFind as a string:
numFind = input("Enter a number to look for: ")
... Although this may introduce some complications, e.g. if the user enters 1, 2, 3, 4 as their list (note the spaces) and 2 as their number, It will say "Appeared 0 time" because " 2" and "2" won't compare equal.

There are 2 issues with the code, First you are comparing int with str and the second is count / length. In Python when you divide int with int you get an int returned not a float (as expected.) so fraction = flost(count) / length would work for you , also you need to convert all the elements in the list to integers which can be done as :
numList = map(int, numInput.split(","))

why am i getting invalid syntax? [duplicate]

This question already has answers here:
Syntax error on print with Python 3 [duplicate]
(3 answers)
Closed 8 years ago.
generate 10 random integers 1-100 store them in a list. Use a loop. Use a second loop to process the list. In this latter loop, display all numbers in the list and determine the sum of the odd numbers and the sum of the even numbers. Display these sums after the second loop has ended. what's wrong?
import random
randomList = [] # create list
sumEven= sumOdd = 0
for x in range(10):
r = random.randint(1,100)
print(r),
randomList.append(r)
for x in range(len(randomList)):
if (randomList[x]%2 == 0): #even number
sumEven += randomList[x]
else:
sumOdd += randomList[x]
print "\nSum of even numbers =",sumEven
print "Sum of odd numbers =",sumOdd

In the future, please post the full error message.
That being said, print is a function. You should use parentheses with it.
https://docs.python.org/3.0/whatsnew/3.0.html#print-is-a-function